Slice 2: telemetry, vitals, chat, spawn/portal, rare, kills and combat stats

The frames the backend reads most, each pinned by a golden test written from
the original's source (field order, JSON types, string-formatted numbers,
mem_mb in bytes, the PascalCase aggregates Newtonsoft emits for combat_stats).
Coordinates repeat the original's float arithmetic from the landblock-local
float, so ew/ns carry the same float-widened values as before. Telemetry goes
out on connect and every 5 s, vitals every 5 s, combat stats every 10 s when
dirty. The rare meta-state switch is not carried over (owner decision); the
allegiance rare announcement and the !report reply are. Kill patterns and
combat patterns are the original's, unchanged.

Also fixes the tick scheduler re-arming repeating jobs from now instead of
from their due time, which made every cadence drift a frame late per period.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

.gitattributes

@@ -0,0 +1,2 @@
+* text=auto eol=lf
+*.cs diff=csharp

src/OpenAC.MosswartMassacre/FeatureCatalog.cs

@@ -1,4 +1,7 @@
 using OpenAC.MosswartMassacre.Backend;
+using OpenAC.MosswartMassacre.Infrastructure;
+using OpenAC.MosswartMassacre.Streams;
+using OpenAC.MosswartMassacre.Trackers;
 
 namespace OpenAC.MosswartMassacre;
 
@@ -10,8 +13,20 @@ internal static class FeatureCatalog
 {
     public static void AddFeatures(MmContext context, BackendSession session, List<IMmFeature> features)
     {
-        _ = context;
+        // Streams and session counters.
-        _ = session;
+        var delayed = new DelayedCommands(context);
-        _ = features;
+        var kills = new KillTracker(context.Clock);
+        var rares = new RareTracker(context, delayed);
+        var combat = new CombatStatsTracker(context);
+        var stats = new SessionStats(context, kills, rares);
+        var telemetry = new TelemetryStream(context, stats);
+        features.Add(stats);
+        features.Add(combat);
+        features.Add(new ChatRouter(context, kills, combat, rares));
+        features.Add(telemetry);
+        features.Add(new VitalsStream(context));
+        features.Add(new SpawnPortalStream(context));
+        features.Add(new BotControl(context));
+        session.AddConnectionListener(telemetry);
     }
 }

src/OpenAC.MosswartMassacre/Infrastructure/DelayedCommands.cs

@@ -0,0 +1,38 @@
+namespace OpenAC.MosswartMassacre.Infrastructure;
+
+/// <summary>
+/// Runs a chat command after a delay, through the chat bar as if typed, so
+/// other plugins' verbs see it too. The original used this to announce a rare
+/// in allegiance chat three seconds after finding it.
+/// </summary>
+internal sealed class DelayedCommands(MmContext context)
+{
+    private readonly List<IDisposable> _pending = [];
+
+    public void Add(string command, double delayMilliseconds)
+    {
+        IDisposable? handle = null;
+        handle = context.Scheduler.Delay(TimeSpan.FromMilliseconds(delayMilliseconds), () =>
+        {
+            if (handle is not null)
+                _pending.Remove(handle);
+            try
+            {
+                context.Automation.Chat.Submit(command);
+            }
+            catch (Exception ex)
+            {
+                context.Chat.Write("Error in delayed command system: " + ex.Message);
+            }
+        });
+        _pending.Add(handle);
+    }
+
+    /// <summary>Drops every command not yet run.</summary>
+    public void Clear()
+    {
+        foreach (IDisposable handle in _pending)
+            handle.Dispose();
+        _pending.Clear();
+    }
+}

src/OpenAC.MosswartMassacre/Infrastructure/MmCoordinates.cs

@@ -0,0 +1,62 @@
+using System.Globalization;
+using AcDream.Plugin.Abstractions;
+
+namespace OpenAC.MosswartMassacre.Infrastructure;
+
+/// <summary>
+/// Map coordinates computed exactly as the original computed them for the
+/// telemetry, rare and sharing frames.
+/// </summary>
+/// <remarks>
+/// The original read the player's landblock-local position as three floats and
+/// converted with single-precision steps, so its east-west and north-south
+/// values are floats widened to double. The backend receives those exact
+/// numbers; recomputing them from the host's double-precision coordinate would
+/// differ in the last digits. This type recovers the landblock-local float the
+/// original read and repeats its arithmetic step for step.
+/// </remarks>
+internal readonly record struct MmCoordinates(double EW, double NS, double Z)
+{
+    /// <summary>The original's conversion of a position, float steps included.</summary>
+    public static MmCoordinates From(in PluginNavigationPosition position)
+    {
+        uint cell = position.CellId;
+        uint blockX = (cell >> 24) & 0xFFu;
+        uint blockY = (cell >> 16) & 0xFFu;
+
+        // The host's map coordinate is ((block - 127) * 192 + local - 84) / 240
+        // metres in doubles; inverting it and narrowing to float gives back the
+        // float the original read from the physics frame.
+        float localX = (float)((position.EastWest * 240d) + 84d - (((double)blockX - 127d) * 192d));
+        float localY = (float)((position.NorthSouth * 240d) + 84d - (((double)blockY - 127d) * 192d));
+        float localZ = (float)(position.Elevation * 240d);
+
+        return new MmCoordinates(LandblockToEW(cell, localX), LandblockToNS(cell, localY), localZ);
+    }
+
+    /// <summary>The original's east-west formula: a float, from the cell's landblock column.</summary>
+    public static float LandblockToEW(uint landcell, float xOff)
+    {
+        uint l = (landcell & 0xFF000000) / 0x200000;
+        return (float)(((xOff / 24) + l - 1019.5) / 10);
+    }
+
+    /// <summary>The original's north-south formula: a float, from the cell's landblock row.</summary>
+    public static float LandblockToNS(uint landcell, float yOff)
+    {
+        uint l = (landcell & 0x00FF0000) / 0x2000;
+        return (float)(((yOff / 24) + l - 1019.5) / 10);
+    }
+
+    /// <summary>Flat distance in metres between two map coordinates, as the original measured it.</summary>
+    public double DistanceToFlat(MmCoordinates other)
+    {
+        double ns = (((NS * 10) + 1019.5) * 24) - (((other.NS * 10) + 1019.5) * 24);
+        double ew = (((EW * 10) + 1019.5) * 24) - (((other.EW * 10) + 1019.5) * 24);
+        return Math.Sqrt((ns * ns) + (ew * ew));
+    }
+
+    public override string ToString() => string.Create(
+        CultureInfo.InvariantCulture,
+        $"{Math.Abs(NS):F2}{(NS >= 0 ? 'N' : 'S')} {Math.Abs(EW):F2}{(EW >= 0 ? 'E' : 'W')}");
+}

src/OpenAC.MosswartMassacre/Infrastructure/ProcessTelemetry.cs

@@ -0,0 +1,58 @@
+using System.Diagnostics;
+
+namespace OpenAC.MosswartMassacre.Infrastructure;
+
+/// <summary>
+/// The client process's own numbers for the telemetry frame: working set in
+/// bytes, open handles, and CPU use in percent of all cores.
+/// </summary>
+/// <remarks>
+/// The original measured CPU by sleeping its sending thread for half a second
+/// on every frame. This measures the same quantity, process CPU time over wall
+/// time across all cores, over the interval since the previous sample, which
+/// never blocks.
+/// </remarks>
+internal sealed class ProcessTelemetry
+{
+    private readonly Process _process = Process.GetCurrentProcess();
+    private TimeSpan _lastCpu;
+    private DateTime _lastWallUtc;
+
+    public ProcessTelemetry()
+    {
+        _lastCpu = _process.TotalProcessorTime;
+        _lastWallUtc = DateTime.UtcNow;
+    }
+
+    /// <summary>Working-set memory in bytes (the original's <c>mem_mb</c>, despite the name).</summary>
+    public long MemoryBytes
+    {
+        get
+        {
+            _process.Refresh();
+            return _process.WorkingSet64;
+        }
+    }
+
+    public int HandleCount
+    {
+        get
+        {
+            _process.Refresh();
+            return _process.HandleCount;
+        }
+    }
+
+    /// <summary>CPU use since the previous call, in percent of all cores.</summary>
+    public float SampleCpuUsage()
+    {
+        _process.Refresh();
+        TimeSpan cpu = _process.TotalProcessorTime;
+        DateTime now = DateTime.UtcNow;
+        double cpuMs = (cpu - _lastCpu).TotalMilliseconds;
+        double elapsedMs = (now - _lastWallUtc).TotalMilliseconds * Environment.ProcessorCount;
+        _lastCpu = cpu;
+        _lastWallUtc = now;
+        return elapsedMs <= 0 ? 0f : (float)(cpuMs / elapsedMs * 100.0);
+    }
+}

src/OpenAC.MosswartMassacre/Infrastructure/TickScheduler.cs

@@ -13,6 +13,9 @@ namespace OpenAC.MosswartMassacre.Infrastructure;
 /// </remarks>
 internal sealed class TickScheduler : IDisposable
 {
+    // Frame times summed in doubles land a hair short of a round due time.
+    private const double DueTolerance = 1e-6;
+
     private readonly IEvents _events;
     private readonly IPluginLogger _log;
     private readonly Action<double> _handler;
@@ -58,7 +61,7 @@ internal sealed class TickScheduler : IDisposable
         _due.Clear();
         foreach (Entry entry in _entries)
         {
-            if (!entry.Cancelled && entry.DueAt <= ElapsedSeconds)
+            if (!entry.Cancelled && entry.DueAt <= ElapsedSeconds + DueTolerance)
                 _due.Add(entry);
         }
 
@@ -67,9 +70,18 @@ internal sealed class TickScheduler : IDisposable
             if (entry.Cancelled)
                 continue;
             if (entry.Repeat)
-                entry.DueAt = ElapsedSeconds + entry.IntervalSeconds;
+            {
+                // Re-arm from the due time, not from now, so a fixed cadence
+                // does not drift late by a frame each period; a job that fell
+                // more than a period behind runs once and resumes from now.
+                entry.DueAt += entry.IntervalSeconds;
+                if (entry.DueAt <= ElapsedSeconds)
+                    entry.DueAt = ElapsedSeconds + entry.IntervalSeconds;
+            }
             else
+            {
                 entry.Cancelled = true;
+            }
             try
             {
                 entry.Callback();

src/OpenAC.MosswartMassacre/MmContext.cs

@@ -62,6 +62,15 @@ internal sealed class MmContext
     /// </summary>
     public string ConnectionSessionId { get; set; } = string.Empty;
 
+    /// <summary>The prismatic taper count for telemetry; the inventory feature supplies it.</summary>
+    public Func<int> PrismaticTaperCount { get; set; } = static () => 0;
+
+    /// <summary>The bot's current meta state name for telemetry, or empty when there is none.</summary>
+    public Func<string> MetaState { get; set; } = static () => string.Empty;
+
+    /// <summary>The character's vitae penalty in percent (0 when none), as the original's vitals frame carried it.</summary>
+    public Func<int> Vitae { get; set; } = static () => 0;
+
     /// <summary>The per-process id the original put in every telemetry frame.</summary>
     public static string ProcessSessionId { get; } = Guid.NewGuid().ToString("N");
 

src/OpenAC.MosswartMassacre/Streams/BotControl.cs

@@ -0,0 +1,36 @@
+namespace OpenAC.MosswartMassacre.Streams;
+
+/// <summary>
+/// The original's commands that drove the bot. They go through the bot's own
+/// <c>/vt</c> verbs, so they work with whichever bot plugin answers to them.
+/// </summary>
+internal sealed class BotControl : IMmFeature
+{
+    private readonly MmContext _context;
+
+    public BotControl(MmContext context)
+    {
+        _context = context;
+        context.Commands.Register("getmetastate", _ => _context.Chat.Write(_context.MetaState() ?? string.Empty), "Show current VTank meta state");
+        context.Commands.Register("nextwp", _ => Submit("/vt nextwp"), "Advance VTank to next waypoint");
+        context.Commands.Register("prevwp", _ => Submit("/vt prevwp"), "Move VTank back to previous waypoint");
+    }
+
+    public void OnLogin()
+    {
+    }
+
+    public void OnLogoff()
+    {
+    }
+
+    public void Dispose()
+    {
+    }
+
+    private void Submit(string command)
+    {
+        if (!_context.Automation.Chat.Submit(command))
+            _context.Chat.Write("Failed to reach VTank. Is it running?");
+    }
+}

src/OpenAC.MosswartMassacre/Streams/ChatLineText.cs

@@ -0,0 +1,47 @@
+using AcDream.Plugin.Abstractions;
+
+namespace OpenAC.MosswartMassacre.Streams;
+
+/// <summary>
+/// A chat line worded the way the chat window shows it, which is the text the
+/// original plugin received for every line and parsed and forwarded.
+/// </summary>
+internal static class ChatLineText
+{
+    // The host's line kinds, in the order the host numbers them.
+    private const int LocalSpeech = 0;
+    private const int RangedSpeech = 1;
+    private const int Channel = 2;
+    private const int Tell = 3;
+    private const int Popup = 5;
+    private const int Emote = 6;
+    private const int SoulEmote = 7;
+
+    public static string Of(in PluginChatMessage message)
+    {
+        string text = message.Text ?? string.Empty;
+        string sender = message.Sender ?? string.Empty;
+        bool own = string.IsNullOrEmpty(sender) || sender == "You";
+        return message.Kind switch
+        {
+            LocalSpeech => own ? $"You say, \"{text}\"" : $"{sender} says, \"{text}\"",
+            RangedSpeech => own ? $"You shout, \"{text}\"" : $"{sender} shouts, \"{text}\"",
+            Channel => ChannelLine(message.ChannelName ?? string.Empty, sender, own, text),
+            Tell => message.SenderObjectId != 0
+                ? $"{sender} tells you, \"{text}\""
+                : $"You tell {sender}, \"{text}\"",
+            Popup => $"[Popup] {text}",
+            Emote or SoulEmote => $"* {sender} {text}",
+            _ => text,
+        };
+    }
+
+    private static string ChannelLine(string channel, string sender, bool own, string text)
+    {
+        if (string.IsNullOrEmpty(channel))
+            return own ? $"You say, \"{text}\"" : $"{sender} says, \"{text}\"";
+        return own
+            ? $"[{channel}] You say, \"{text}\""
+            : $"[{channel}] {sender} says, \"{text}\"";
+    }
+}

src/OpenAC.MosswartMassacre/Streams/ChatRouter.cs

@@ -0,0 +1,106 @@
+using System.Globalization;
+using System.Text.RegularExpressions;
+using AcDream.Plugin.Abstractions;
+using OpenAC.MosswartMassacre.Backend;
+using OpenAC.MosswartMassacre.Trackers;
+
+namespace OpenAC.MosswartMassacre.Streams;
+
+/// <summary>
+/// Every chat line, in the original's order: first the kill counter, the combat
+/// tracker, the rare tracker and the allegiance <c>!report</c> reply read it;
+/// then the line goes to the backend as a <c>chat</c> frame.
+/// </summary>
+internal sealed class ChatRouter : IMmFeature
+{
+    /// <summary>The retail text class of allegiance chat, as the original compared it.</summary>
+    public const int AllegianceColor = 18;
+
+    private readonly MmContext _context;
+    private readonly KillTracker _kills;
+    private readonly CombatStatsTracker _combat;
+    private readonly RareTracker _rares;
+    private readonly Action<PluginChatMessage> _onReceived;
+    private bool _subscribed;
+
+    public ChatRouter(MmContext context, KillTracker kills, CombatStatsTracker combat, RareTracker rares)
+    {
+        _context = context;
+        _kills = kills;
+        _combat = combat;
+        _rares = rares;
+        _onReceived = OnReceived;
+    }
+
+    public void OnLogin()
+    {
+        if (_subscribed)
+            return;
+        _context.Automation.Chat.Received += _onReceived;
+        _subscribed = true;
+    }
+
+    public void OnLogoff()
+    {
+        if (!_subscribed)
+            return;
+        _context.Automation.Chat.Received -= _onReceived;
+        _subscribed = false;
+    }
+
+    public void Dispose() => OnLogoff();
+
+    internal void OnReceived(PluginChatMessage message)
+    {
+        // Status notices float over the world and never reach the chat window.
+        if (message.Kind == PluginChatMessage.StatusTextKind)
+            return;
+
+        string text = ChatLineText.Of(message);
+        int color = message.LogTextType;
+
+        try
+        {
+            _kills.CheckForKill(text);
+            _combat.ProcessChatLine(text);
+            if (_rares.CheckForRare(text, out _))
+                _kills.RareCount = _rares.RareCount;
+
+            if (color == AllegianceColor && text.EndsWith("!report\"", StringComparison.Ordinal))
+            {
+                TimeSpan elapsed = _context.Clock.Now - _kills.StatsStartTime;
+                string report = string.Format(
+                    CultureInfo.CurrentCulture,
+                    "Total Kills: {0}, Kills per Hour: {1:F2}, Elapsed Time: {2:dd\\.hh\\:mm\\:ss}, Rares Found: {3}",
+                    _kills.TotalKills, _kills.KillsPerHour, elapsed, _rares.RareCount);
+                _context.Host.Log.Info($"[Mosswart Massacre] Reporting to allegiance: {report}");
+                _context.Automation.Chat.Submit($"/a {report}");
+            }
+        }
+        catch (Exception ex)
+        {
+            _context.Chat.Write("Error processing chat message: " + ex.Message);
+        }
+
+        SendChat(color, Normalize(text));
+    }
+
+    private void SendChat(int color, string text) => _context.Send(new
+    {
+        type = "chat",
+        timestamp = Wire.Timestamp(_context.Clock),
+        character_name = _context.CharacterName,
+        text,
+        color,
+    });
+
+    /// <summary>The original's clean-up: tags removed, trailing line breaks trimmed, runs of spaces collapsed.</summary>
+    internal static string Normalize(string raw)
+    {
+        if (string.IsNullOrEmpty(raw))
+            return raw;
+        string noTags = Regex.Replace(raw, "<[^>]+>", "");
+        string trimmed = noTags.TrimEnd('\r', '\n');
+        return Regex.Replace(trimmed, @"[ ]{2,}", " ");
+    }
+}

src/OpenAC.MosswartMassacre/Streams/SessionStats.cs

@@ -0,0 +1,129 @@
+using System.Globalization;
+using OpenAC.MosswartMassacre.Infrastructure;
+using OpenAC.MosswartMassacre.Trackers;
+
+namespace OpenAC.MosswartMassacre.Streams;
+
+/// <summary>
+/// The session's counters (kills, deaths, rares) and the commands that show or
+/// reset them. The original loaded with each character, so a login starts a
+/// fresh session.
+/// </summary>
+internal sealed class SessionStats : IMmFeature
+{
+    /// <summary>The player's number-of-deaths property.</summary>
+    public const uint NumDeathsProperty = 43;
+
+    private readonly MmContext _context;
+    private readonly Action<string> _onDied;
+    private IDisposable? _statsTimer;
+
+    public SessionStats(MmContext context, KillTracker kills, RareTracker rares)
+    {
+        _context = context;
+        Kills = kills;
+        Rares = rares;
+        _onDied = _ => OnDeath();
+
+        context.Commands.Register("report", _ => Report(), "Show kill/death/rare stats");
+        context.Commands.Register("loc", _ => Location(), "Show current location");
+        context.Commands.Register("reset", _ => Reset(), "Reset kill/rare counters");
+        context.Commands.Register("deathstats", _ => DeathStats(), "Show death tracking stats");
+        context.Commands.Register("verbose", _ => ToggleVerbose(), "Toggle verbose debug logging");
+    }
+
+    public KillTracker Kills { get; }
+
+    public RareTracker Rares { get; }
+
+    public void OnLogin()
+    {
+        Kills.RestartStats();
+        Rares.RareCount = 0;
+        Kills.SetTotalDeaths(ReadNumDeaths());
+        _statsTimer ??= _context.Scheduler.Every(TimeSpan.FromSeconds(1), Kills.Update);
+        _context.Host.Events.LocalPlayerDied += _onDied;
+    }
+
+    public void OnLogoff()
+    {
+        _context.Host.Events.LocalPlayerDied -= _onDied;
+        _statsTimer?.Dispose();
+        _statsTimer = null;
+    }
+
+    public void Dispose() => OnLogoff();
+
+    internal void OnDeath()
+    {
+        Kills.OnDeath();
+        Kills.SetTotalDeaths(ReadNumDeaths());
+    }
+
+    private int ReadNumDeaths()
+    {
+        try
+        {
+            return _context.Automation.Objects.TryGetIntProperty(
+                _context.Automation.Character.ObjectId, NumDeathsProperty, out int deaths)
+                ? deaths
+                : 0;
+        }
+        catch
+        {
+            return 0;
+        }
+    }
+
+    private void Report()
+    {
+        TimeSpan elapsed = _context.Clock.Now - Kills.StatsStartTime;
+        _context.Chat.Write(string.Format(
+            CultureInfo.CurrentCulture,
+            "Total Kills: {0}, Kills per Hour: {1:F2}, Elapsed Time: {2:dd\\.hh\\:mm\\:ss}, Rares Found: {3}, Session Deaths: {4}, Total Deaths: {5}",
+            Kills.TotalKills, Kills.KillsPerHour, elapsed, Rares.RareCount, Kills.SessionDeaths, Kills.TotalDeaths));
+    }
+
+    private void Location()
+    {
+        var position = _context.Automation.Navigation.Snapshot.Position;
+        MmCoordinates here = MmCoordinates.From(position);
+        uint blockX = (position.CellId >> 24) & 0xFFu;
+        uint blockY = (position.CellId >> 16) & 0xFFu;
+        double x = (position.EastWest * 240d) + 84d - (((double)blockX - 127d) * 192d);
+        double y = (position.NorthSouth * 240d) + 84d - (((double)blockY - 127d) * 192d);
+        _context.Chat.Write(string.Create(
+            CultureInfo.CurrentCulture,
+            $"Location: {here}  (X={x:F1}, Y={y:F1}, Z={here.Z:F1})"));
+    }
+
+    private void Reset()
+    {
+        Kills.RestartStats();
+        Rares.RareCount = 0;
+        _context.Chat.Write($"Stats have been reset. Session deaths: {Kills.SessionDeaths}, Total deaths: {Kills.TotalDeaths}");
+    }
+
+    private void DeathStats()
+    {
+        _context.Chat.Write("=== Death Tracking Statistics ===");
+        _context.Chat.Write($"Session Deaths: {Kills.SessionDeaths}");
+        _context.Chat.Write($"Total Deaths: {Kills.TotalDeaths}");
+        int current = ReadNumDeaths();
+        _context.Chat.Write($"Character Property NumDeaths: {current}");
+        if (current != Kills.TotalDeaths)
+        {
+            _context.Chat.Write("[WARNING] Death count sync issue detected!");
+            _context.Chat.Write($"Updating totalDeaths from {Kills.TotalDeaths} to {current}");
+            Kills.SetTotalDeaths(current);
+        }
+        _context.Chat.Write("Death tracking is active and will increment on character death.");
+    }
+
+    private void ToggleVerbose()
+    {
+        _context.Settings.Current.VerboseLogging = !_context.Settings.Current.VerboseLogging;
+        _context.Settings.Save();
+        _context.Chat.Write($"Verbose logging: {(_context.Settings.Current.VerboseLogging ? "ENABLED" : "DISABLED")}");
+    }
+}

src/OpenAC.MosswartMassacre/Streams/SpawnPortalStream.cs

@@ -0,0 +1,110 @@
+using System.Globalization;
+using AcDream.Plugin.Abstractions;
+using OpenAC.MosswartMassacre.Backend;
+using OpenAC.MosswartMassacre.Infrastructure;
+
+namespace OpenAC.MosswartMassacre.Streams;
+
+/// <summary>
+/// The <c>spawn</c> frame for every monster that appears and the
+/// <c>portal</c> frame for every portal that appears within 240 metres, with
+/// the coordinates as strings the way the original formatted them.
+/// </summary>
+internal sealed class SpawnPortalStream : IMmFeature
+{
+    public const double PortalRangeMeters = 240.0;
+
+    private readonly MmContext _context;
+    private readonly Action<PluginObjectChange> _onChanged;
+    private bool _subscribed;
+
+    public SpawnPortalStream(MmContext context)
+    {
+        _context = context;
+        _onChanged = OnObjectChanged;
+    }
+
+    public void OnLogin()
+    {
+        if (_subscribed)
+            return;
+        _context.Host.Events.ObjectChanged += _onChanged;
+        _subscribed = true;
+    }
+
+    public void OnLogoff()
+    {
+        if (!_subscribed)
+            return;
+        _context.Host.Events.ObjectChanged -= _onChanged;
+        _subscribed = false;
+    }
+
+    public void Dispose() => OnLogoff();
+
+    internal void OnObjectChanged(PluginObjectChange change)
+    {
+        if (change.Kind != PluginObjectChangeKind.Created || change.Current is not { } obj)
+            return;
+        try
+        {
+            if (obj.ObjectClass == PluginObjectClass.Monster)
+                OnSpawn(obj);
+            else if (obj.ObjectClass == PluginObjectClass.Portal)
+                OnPortal(obj);
+        }
+        catch (Exception ex)
+        {
+            _context.Chat.Write($"[WS] Spawn send failed: {ex}");
+        }
+    }
+
+    private void OnSpawn(PluginWorldObject mob)
+    {
+        if (!mob.HasPosition)
+            return;
+        (string ns, string ew, string z) = Format(mob.Position);
+        _context.Send(new
+        {
+            type = "spawn",
+            timestamp = Wire.Timestamp(_context.Clock),
+            character_name = _context.CharacterName,
+            mob = mob.Name,
+            ns,
+            ew,
+            z,
+        });
+    }
+
+    private void OnPortal(PluginWorldObject portal)
+    {
+        if (!portal.HasPosition)
+            return;
+
+        var portalPos = new MmCoordinates(portal.Position.EastWest, portal.Position.NorthSouth, 0);
+        MmCoordinates player = MmCoordinates.From(_context.Automation.Navigation.Snapshot.Position);
+        if (player.DistanceToFlat(portalPos) > PortalRangeMeters)
+            return;
+
+        (string ns, string ew, string z) = Format(portal.Position);
+        _context.Send(new
+        {
+            type = "portal",
+            timestamp = Wire.Timestamp(_context.Clock),
+            character_name = _context.CharacterName,
+            portal_name = portal.Name,
+            ns,
+            ew,
+            z,
+        });
+    }
+
+    private static (string Ns, string Ew, string Z) Format(in PluginNavigationPosition position)
+    {
+        const string fmt = "F7";
+        string ns = position.NorthSouth.ToString(fmt, CultureInfo.InvariantCulture);
+        string ew = position.EastWest.ToString(fmt, CultureInfo.InvariantCulture);
+        string z = ((float)(position.Elevation * 240d)).ToString("F2", CultureInfo.InvariantCulture);
+        return (ns, ew, z);
+    }
+}

src/OpenAC.MosswartMassacre/Streams/TelemetryStream.cs

@@ -0,0 +1,84 @@
+using System.Globalization;
+using OpenAC.MosswartMassacre.Backend;
+using OpenAC.MosswartMassacre.Infrastructure;
+
+namespace OpenAC.MosswartMassacre.Streams;
+
+/// <summary>
+/// The <c>telemetry</c> frame: sent right after the socket registers and then
+/// every five seconds, as the original's socket loop did.
+/// </summary>
+/// <remarks>
+/// Several fields are strings on the wire (kill rate, deaths, taper count) and
+/// <c>mem_mb</c> carries bytes; the backend reads them that way.
+/// </remarks>
+internal sealed class TelemetryStream : IMmFeature, IBackendConnectionListener
+{
+    public static readonly TimeSpan Interval = TimeSpan.FromSeconds(5);
+
+    private readonly MmContext _context;
+    private readonly SessionStats _stats;
+    private readonly ProcessTelemetry _process = new();
+    private IDisposable? _timer;
+
+    public TelemetryStream(MmContext context, SessionStats stats)
+    {
+        _context = context;
+        _stats = stats;
+    }
+
+    public void OnBackendConnected()
+    {
+        if (!_context.IsLoggedIn)
+            return;
+        SendNow();
+        _timer?.Dispose();
+        _timer = _context.Scheduler.Every(Interval, SendNow);
+    }
+
+    public void OnLogin()
+    {
+    }
+
+    public void OnLogoff()
+    {
+        _timer?.Dispose();
+        _timer = null;
+    }
+
+    public void Dispose() => OnLogoff();
+
+    internal void SendNow()
+    {
+        if (!_context.IsLoggedIn)
+            return;
+        _context.Send(Build());
+    }
+
+    internal object Build()
+    {
+        MmCoordinates coords = MmCoordinates.From(_context.Automation.Navigation.Snapshot.Position);
+        var kills = _stats.Kills;
+        return new
+        {
+            type = "telemetry",
+            character_name = _context.CharacterName,
+            char_tag = _context.Settings.Current.CharTag ?? "",
+            session_id = MmContext.ProcessSessionId,
+            timestamp = Wire.Timestamp(_context.Clock),
+            ew = coords.EW,
+            ns = coords.NS,
+            z = coords.Z,
+            kills = kills.TotalKills,
+            kills_per_hour = kills.KillsPerHour.ToString("F0", CultureInfo.CurrentCulture),
+            onlinetime = (_context.Clock.Now - kills.StatsStartTime).ToString(@"dd\.hh\:mm\:ss", CultureInfo.InvariantCulture),
+            deaths = kills.SessionDeaths.ToString(CultureInfo.CurrentCulture),
+            total_deaths = kills.TotalDeaths.ToString(CultureInfo.CurrentCulture),
+            prismatic_taper_count = _context.PrismaticTaperCount().ToString(CultureInfo.CurrentCulture),
+            vt_state = _context.MetaState() ?? string.Empty,
+            mem_mb = _process.MemoryBytes,
+            cpu_pct = _process.SampleCpuUsage(),
+            mem_handles = _process.HandleCount,
+        };
+    }
+}

src/OpenAC.MosswartMassacre/Streams/VitalsStream.cs

@@ -0,0 +1,55 @@
+using OpenAC.MosswartMassacre.Backend;
+
+namespace OpenAC.MosswartMassacre.Streams;
+
+/// <summary>
+/// The <c>vitals</c> frame every five seconds while streaming is on. The
+/// backend watches <c>vitae</c> going from 0 to above 0 to notice a death.
+/// </summary>
+internal sealed class VitalsStream(MmContext context) : IMmFeature
+{
+    public static readonly TimeSpan Interval = TimeSpan.FromSeconds(5);
+
+    private IDisposable? _timer;
+
+    public void OnLogin() => _timer ??= context.Scheduler.Every(Interval, SendNow);
+
+    public void OnLogoff()
+    {
+        _timer?.Dispose();
+        _timer = null;
+    }
+
+    public void Dispose() => OnLogoff();
+
+    internal void SendNow()
+    {
+        if (!context.Settings.Current.WebSocketEnabled || !context.IsLoggedIn)
+            return;
+
+        var character = context.Automation.Character;
+        int currentHealth = (int)character.CurrentHealth;
+        int currentStamina = (int)character.CurrentStamina;
+        int currentMana = (int)character.CurrentMana;
+        int maxHealth = (int)character.MaxHealth;
+        int maxStamina = (int)character.MaxStamina;
+        int maxMana = (int)character.MaxMana;
+
+        context.Send(new
+        {
+            type = "vitals",
+            timestamp = Wire.Timestamp(context.Clock),
+            character_name = context.CharacterName,
+            health_current = currentHealth,
+            health_max = maxHealth,
+            health_percentage = maxHealth > 0 ? Math.Round((double)currentHealth / maxHealth * 100, 1) : 0,
+            stamina_current = currentStamina,
+            stamina_max = maxStamina,
+            stamina_percentage = maxStamina > 0 ? Math.Round((double)currentStamina / maxStamina * 100, 1) : 0,
+            mana_current = currentMana,
+            mana_max = maxMana,
+            mana_percentage = maxMana > 0 ? Math.Round((double)currentMana / maxMana * 100, 1) : 0,
+            vitae = context.Vitae(),
+        });
+    }
+}

src/OpenAC.MosswartMassacre/Trackers/CombatInfo.cs

@@ -0,0 +1,166 @@
+// The combat_stats wire model, kept exactly as the original declared it:
+// public fields with snake_case names, enum names as strings, and the
+// aggregate getters Newtonsoft also emits (the backend receives those too).
+#nullable disable
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Newtonsoft.Json;
+using Newtonsoft.Json.Converters;
+
+namespace OpenAC.MosswartMassacre.Trackers
+{
+    [JsonConverter(typeof(StringEnumConverter))]
+    public enum DamageElement
+    {
+        None,
+        Unknown,
+        Typeless,
+        Slash,
+        Pierce,
+        Bludgeon,
+        Fire,
+        Cold,
+        Acid,
+        Electric,
+    }
+
+    [JsonConverter(typeof(StringEnumConverter))]
+    public enum AttackType
+    {
+        Unknown,
+        MeleeMissile,
+        Magic,
+    }
+
+    /// <summary>
+    /// Per-element damage statistics within a single attack type.
+    /// Mirrors Mag-Tools CombatInfo.DamageByAttackType.DamageByElement.
+    /// </summary>
+    public class DamageStats
+    {
+        [JsonProperty("total_attacks")]   public int TotalAttacks;
+        [JsonProperty("failed_attacks")]  public int FailedAttacks;
+        [JsonProperty("crits")]           public int Crits;
+        [JsonProperty("total_normal_damage")] public int TotalNormalDamage;
+        [JsonProperty("max_normal_damage")]   public int MaxNormalDamage;
+        [JsonProperty("total_crit_damage")]   public int TotalCritDamage;
+        [JsonProperty("max_crit_damage")]     public int MaxCritDamage;
+        [JsonProperty("killing_blows")]       public int KillingBlows;
+
+        [JsonProperty("damage")]
+        public int Damage => TotalNormalDamage + TotalCritDamage;
+    }
+
+    /// <summary>
+    /// Per-monster combat record. Stores offense and defense breakdowns
+    /// keyed by AttackType → DamageElement → DamageStats. Mirrors
+    /// Mag-Tools CombatInfo but without the source/target pair split
+    /// (we always track relative to the local character).
+    /// </summary>
+    public class MonsterCombatRecord
+    {
+        [JsonProperty("name")]            public string Name;
+        [JsonProperty("kill_count")]      public int KillCount;
+        [JsonProperty("damage_given")]    public long DamageGiven;
+        [JsonProperty("damage_received")] public long DamageReceived;
+        [JsonProperty("aetheria_surges")] public int AetheriaSurges;
+        [JsonProperty("cloak_surges")]    public int CloakSurges;
+
+        // offense[AttackType][DamageElement] = stats for damage WE dealt
+        [JsonProperty("offense")]
+        public Dictionary<AttackType, Dictionary<DamageElement, DamageStats>> Offense
+            = new Dictionary<AttackType, Dictionary<DamageElement, DamageStats>>();
+
+        // defense[AttackType][DamageElement] = stats for damage WE received
+        [JsonProperty("defense")]
+        public Dictionary<AttackType, Dictionary<DamageElement, DamageStats>> Defense
+            = new Dictionary<AttackType, Dictionary<DamageElement, DamageStats>>();
+
+        public DamageStats GetOrCreateStats(
+            Dictionary<AttackType, Dictionary<DamageElement, DamageStats>> side,
+            AttackType at, DamageElement el)
+        {
+            if (!side.TryGetValue(at, out var byElement))
+            {
+                byElement = new Dictionary<DamageElement, DamageStats>();
+                side[at] = byElement;
+            }
+            if (!byElement.TryGetValue(el, out var stats))
+            {
+                stats = new DamageStats();
+                byElement[el] = stats;
+            }
+            return stats;
+        }
+
+        // ── Aggregate helpers matching Mag-Tools CombatTrackerGUI calculations ──
+
+        public int TotalOffenseAttacks =>
+            Offense.Values.SelectMany(d => d.Values).Sum(s => s.TotalAttacks);
+        public int TotalOffenseFailedAttacks =>
+            Offense.Values.SelectMany(d => d.Values).Sum(s => s.FailedAttacks);
+        public int TotalOffenseCrits =>
+            Offense.Values.SelectMany(d => d.Values).Sum(s => s.Crits);
+        public long TotalOffenseNormalDamage =>
+            Offense.Values.SelectMany(d => d.Values).Sum(s => (long)s.TotalNormalDamage);
+        public int MaxOffenseNormalDamage =>
+            Offense.Values.SelectMany(d => d.Values).Select(s => s.MaxNormalDamage).DefaultIfEmpty(0).Max();
+        public long TotalOffenseCritDamage =>
+            Offense.Values.SelectMany(d => d.Values).Sum(s => (long)s.TotalCritDamage);
+        public int MaxOffenseCritDamage =>
+            Offense.Values.SelectMany(d => d.Values).Select(s => s.MaxCritDamage).DefaultIfEmpty(0).Max();
+
+        public int TotalDefenseAttacks =>
+            Defense.Values.SelectMany(d => d.Values).Sum(s => s.TotalAttacks);
+        public int TotalDefenseFailedAttacks =>
+            Defense.Values.SelectMany(d => d.Values).Sum(s => s.FailedAttacks);
+
+        // Defense damage by element for the breakdown grid
+        public int GetDefenseDamage(AttackType at, DamageElement el)
+        {
+            if (!Defense.TryGetValue(at, out var byEl)) return 0;
+            if (!byEl.TryGetValue(el, out var stats)) return 0;
+            return stats.Damage;
+        }
+    }
+
+    /// <summary>
+    /// Holds all combat data for a single session (or lifetime accumulation).
+    /// Serializes cleanly to JSON for the WebSocket combat_stats envelope.
+    /// </summary>
+    public class CombatSessionState
+    {
+        [JsonProperty("total_damage_given")]    public long TotalDamageGiven;
+        [JsonProperty("total_damage_received")] public long TotalDamageReceived;
+        [JsonProperty("total_kills")]           public int TotalKills;
+        [JsonProperty("total_aetheria_surges")] public int TotalAetheriaSurges;
+        [JsonProperty("total_cloak_surges")]    public int TotalCloakSurges;
+        [JsonProperty("session_start")]         public string SessionStart;
+
+        [JsonProperty("monsters")]
+        public Dictionary<string, MonsterCombatRecord> Monsters
+            = new Dictionary<string, MonsterCombatRecord>(StringComparer.OrdinalIgnoreCase);
+
+        public MonsterCombatRecord GetOrCreateMonster(string name)
+        {
+            if (!Monsters.TryGetValue(name, out var rec))
+            {
+                rec = new MonsterCombatRecord { Name = name };
+                Monsters[name] = rec;
+            }
+            return rec;
+        }
+
+        public void Clear()
+        {
+            TotalDamageGiven = 0;
+            TotalDamageReceived = 0;
+            TotalKills = 0;
+            TotalAetheriaSurges = 0;
+            TotalCloakSurges = 0;
+            SessionStart = DateTime.UtcNow.ToString("o");
+            Monsters.Clear();
+        }
+    }
+}

src/OpenAC.MosswartMassacre/Trackers/CombatStatsTracker.cs

@@ -0,0 +1,394 @@
+using System.Text.RegularExpressions;
+using OpenAC.MosswartMassacre.Backend;
+
+namespace OpenAC.MosswartMassacre.Trackers;
+
+/// <summary>
+/// Parses combat chat into per-monster offense and defense statistics and
+/// sends a <c>combat_stats</c> snapshot every ten seconds when anything
+/// changed. The patterns and their order are the original's, which mirror
+/// Mag-Tools' combat tracker; the backend accumulates the lifetime totals.
+/// </summary>
+internal sealed class CombatStatsTracker : IMmFeature
+{
+    public static readonly TimeSpan SendInterval = TimeSpan.FromSeconds(10);
+
+    private readonly MmContext _context;
+    private CombatSessionState _sessionState = new();
+    private IDisposable? _sendTimer;
+    private bool _dirty;
+
+    public CombatStatsTracker(MmContext context)
+    {
+        _context = context;
+    }
+
+    internal CombatSessionState Session => _sessionState;
+
+    public void OnLogin()
+    {
+        RestartSession();
+        _sendTimer ??= _context.Scheduler.Every(SendInterval, OnSendTick);
+    }
+
+    public void OnLogoff()
+    {
+        _sendTimer?.Dispose();
+        _sendTimer = null;
+    }
+
+    public void Dispose() => OnLogoff();
+
+    public void RestartSession()
+    {
+        _sessionState = new CombatSessionState();
+        _sessionState.Clear();
+        _sessionState.SessionStart = Wire.Timestamp(_context.Clock);
+        _dirty = true;
+    }
+
+    public void ProcessChatLine(string text)
+    {
+        if (string.IsNullOrEmpty(text))
+            return;
+
+        try
+        {
+            // Chat lines carry tell-link tags and may end in a line break;
+            // strip both so the ^...$ anchors work.
+            text = Regex.Replace(text, "<[^>]+>", "");
+            text = text.TrimEnd('\r', '\n', ' ');
+            if (string.IsNullOrEmpty(text))
+                return;
+
+            if (IsNonCombatChat(text))
+                return;
+
+            bool isCrit = text.Contains("Critical hit!");
+            bool isOverpower = text.Contains("Overpower!");
+            bool isSneakAttack = text.Contains("Sneak Attack!");
+            bool isRecklessness = text.Contains("Recklessness!");
+
+            string myName = _context.CharacterName;
+
+            if (TryParseAetheriaSurge(text))
+                return;
+
+            if (TryParseCloakSurge(text))
+                return;
+
+            if (TryParseFailedAttack(text, myName))
+                return;
+
+            if (TryParseKill(text))
+                return;
+
+            if (TryMatchPatterns(MeleeMissileReceived, text, out string recvSource, out int recvDmg))
+            {
+                RecordHit(recvSource, myName, AttackType.MeleeMissile, GetElementFromText(text),
+                          recvDmg, isCrit, isOverpower, isSneakAttack, isRecklessness);
+                return;
+            }
+
+            if (TryMatchPatterns(MeleeMissileGiven, text, out string givenTarget, out int givenDmg))
+            {
+                RecordHit(myName, givenTarget, AttackType.MeleeMissile, GetElementFromText(text),
+                          givenDmg, isCrit, isOverpower, isSneakAttack, isRecklessness);
+                return;
+            }
+
+            if (TryMatchPatterns(MagicReceived, text, out string magRecvSource, out int magRecvDmg))
+            {
+                RecordHit(magRecvSource, myName, AttackType.Magic, GetElementFromText(text),
+                          magRecvDmg, isCrit, isOverpower, isSneakAttack, isRecklessness);
+                return;
+            }
+
+            if (TryMatchPatterns(MagicGiven, text, out string magGivenTarget, out int magGivenDmg))
+            {
+                RecordHit(myName, magGivenTarget, AttackType.Magic, GetElementFromText(text),
+                          magGivenDmg, isCrit, isOverpower, isSneakAttack, isRecklessness);
+            }
+        }
+        catch (Exception ex)
+        {
+            _context.Verbose($"[CombatStats] Parse error: {ex.Message}");
+        }
+    }
+
+    // ── Recording ──
+
+    private void RecordHit(string source, string target, AttackType at, DamageElement el,
+                           int damage, bool isCrit, bool isOverpower, bool isSneakAttack, bool isRecklessness)
+    {
+        _ = isOverpower;
+        _ = isSneakAttack;
+        _ = isRecklessness;
+        string myName = _context.CharacterName;
+        bool weAreSource = source.Equals(myName, StringComparison.OrdinalIgnoreCase);
+        string monsterName = weAreSource ? target : source;
+        if (string.IsNullOrEmpty(monsterName))
+            return;
+
+        MonsterCombatRecord rec = _sessionState.GetOrCreateMonster(monsterName);
+        var side = weAreSource ? rec.Offense : rec.Defense;
+        DamageStats stats = rec.GetOrCreateStats(side, at, el);
+
+        stats.TotalAttacks++;
+        if (isCrit)
+        {
+            stats.Crits++;
+            stats.TotalCritDamage += damage;
+            if (damage > stats.MaxCritDamage)
+                stats.MaxCritDamage = damage;
+        }
+        else
+        {
+            stats.TotalNormalDamage += damage;
+            if (damage > stats.MaxNormalDamage)
+                stats.MaxNormalDamage = damage;
+        }
+
+        if (weAreSource)
+        {
+            rec.DamageGiven += damage;
+            _sessionState.TotalDamageGiven += damage;
+        }
+        else
+        {
+            rec.DamageReceived += damage;
+            _sessionState.TotalDamageReceived += damage;
+        }
+
+        _dirty = true;
+    }
+
+    private void RecordFailedAttack(string source, string target, AttackType at)
+    {
+        string myName = _context.CharacterName;
+        bool weAreSource = source.Equals(myName, StringComparison.OrdinalIgnoreCase);
+        string monsterName = weAreSource ? target : source;
+        if (string.IsNullOrEmpty(monsterName))
+            return;
+
+        MonsterCombatRecord rec = _sessionState.GetOrCreateMonster(monsterName);
+        var side = weAreSource ? rec.Offense : rec.Defense;
+        DamageStats stats = rec.GetOrCreateStats(side, at, DamageElement.None);
+        stats.TotalAttacks++;
+        stats.FailedAttacks++;
+        _dirty = true;
+    }
+
+    private void RecordKill(string targetName)
+    {
+        if (string.IsNullOrEmpty(targetName))
+            return;
+        MonsterCombatRecord rec = _sessionState.GetOrCreateMonster(targetName);
+        rec.KillCount++;
+        _sessionState.TotalKills++;
+        _dirty = true;
+    }
+
+    private void RecordAetheriaSurge(string targetName)
+    {
+        if (string.IsNullOrEmpty(targetName))
+            return;
+        MonsterCombatRecord rec = _sessionState.GetOrCreateMonster(targetName);
+        rec.AetheriaSurges++;
+        _sessionState.TotalAetheriaSurges++;
+        _dirty = true;
+    }
+
+    private void RecordCloakSurge(string sourceName)
+    {
+        if (string.IsNullOrEmpty(sourceName))
+            return;
+        MonsterCombatRecord rec = _sessionState.GetOrCreateMonster(sourceName);
+        rec.CloakSurges++;
+        _sessionState.TotalCloakSurges++;
+        _dirty = true;
+    }
+
+    // ── Patterns, as the original listed them ──
+
+    private static readonly Regex[] FailedAttacks =
+    [
+        new Regex(@"^You evaded (?<name>.+)!$", RegexOptions.Compiled),
+        new Regex(@"^(?<name>.+) evaded your attack\.$", RegexOptions.Compiled),
+        new Regex(@"^You resist the spell cast by (?<name>.+)$", RegexOptions.Compiled),
+        new Regex(@"^(?<name>.+) resists your spell$", RegexOptions.Compiled),
+    ];
+
+    private bool TryParseFailedAttack(string text, string myName)
+    {
+        foreach (Regex rx in FailedAttacks)
+        {
+            Match m = rx.Match(text);
+            if (!m.Success)
+                continue;
+            string parsed = m.Groups["name"].Value;
+
+            if (text.StartsWith("You evaded ", StringComparison.Ordinal))
+                RecordFailedAttack(parsed, myName, AttackType.MeleeMissile);
+            else if (text.Contains(" evaded your attack"))
+                RecordFailedAttack(myName, parsed, AttackType.MeleeMissile);
+            else if (text.StartsWith("You resist the spell cast by ", StringComparison.Ordinal))
+                RecordFailedAttack(parsed, myName, AttackType.Magic);
+            else if (text.Contains(" resists your spell"))
+                RecordFailedAttack(myName, parsed, AttackType.Magic);
+
+            return true;
+        }
+        return false;
+    }
+
+    private static readonly Regex[] KillPatterns =
+        [.. KillTracker.KillPatterns.Select(pattern => new Regex(pattern, RegexOptions.Compiled))];
+
+    private bool TryParseKill(string text)
+    {
+        foreach (Regex rx in KillPatterns)
+        {
+            Match m = rx.Match(text);
+            if (m.Success)
+            {
+                RecordKill(m.Groups["targetname"].Value);
+                return true;
+            }
+        }
+        return false;
+    }
+
+    private static readonly Regex[] MeleeMissileReceived =
+    [
+        new Regex(@"^Critical hit! Overpower! (?<name>.+) [\w]+ your .+ for (?<points>\d+) point.* of .+ damage", RegexOptions.Compiled),
+        new Regex(@"^Critical hit! (?<name>.+) [\w]+ your .+ for (?<points>\d+) point.* of .+ damage", RegexOptions.Compiled),
+        new Regex(@"^Overpower! (?<name>.+) [\w]+ your .+ for (?<points>\d+) point.* of .+ damage", RegexOptions.Compiled),
+        new Regex(@"^(?<name>.+) [\w]+ your .+ for (?<points>\d+) point.* of .+ damage", RegexOptions.Compiled),
+    ];
+
+    private static readonly Regex[] MeleeMissileGiven =
+    [
+        new Regex(@"^Critical hit!\s+Sneak Attack! Recklessness! You [\w]+ (?<name>.+) for (?<points>\d+) point.* of .+ damage", RegexOptions.Compiled),
+        new Regex(@"^Critical hit!\s+Sneak Attack! You [\w]+ (?<name>.+) for (?<points>\d+) point.* of .+ damage", RegexOptions.Compiled),
+        new Regex(@"^Critical hit!\s+You [\w]+ (?<name>.+) for (?<points>\d+) point.* of .+ damage", RegexOptions.Compiled),
+        new Regex(@"^Sneak Attack! Recklessness! You [\w]+ (?<name>.+) for (?<points>\d+) point.* of .+ damage", RegexOptions.Compiled),
+        new Regex(@"^Sneak Attack! You [\w]+ (?<name>.+) for (?<points>\d+) point.* of .+ damage", RegexOptions.Compiled),
+        new Regex(@"^Recklessness! You [\w]+ (?<name>.+) for (?<points>\d+) point.* of .+ damage", RegexOptions.Compiled),
+        new Regex(@"^You [\w]+ (?<name>.+) for (?<points>\d+) point.* of .+ damage", RegexOptions.Compiled),
+    ];
+
+    private static readonly Regex[] MagicReceived =
+    [
+        new Regex(@"^Critical hit! Overpower! (?<name>.+) [\w]+ you for (?<points>\d+) point.* with .+$", RegexOptions.Compiled),
+        new Regex(@"^Critical hit! (?<name>.+) [\w]+ you for (?<points>\d+) point.* with .+$", RegexOptions.Compiled),
+        new Regex(@"^Overpower! (?<name>.+) [\w]+ you for (?<points>\d+) point.* with .+$", RegexOptions.Compiled),
+        new Regex(@"^(?<name>.+) [\w]+ you for (?<points>\d+) point.* with .+$", RegexOptions.Compiled),
+        new Regex(@"^Magical energies lose (?<points>\d+) point.* of health due to (?<name>.+) casting .+$", RegexOptions.Compiled),
+        new Regex(@"^You lose (?<points>\d+) point.* of health due to (?<name>.+) casting .+$", RegexOptions.Compiled),
+        new Regex(@"^(?<name>.+) casts .+ and drains (?<points>\d+) point.* .+$", RegexOptions.Compiled),
+    ];
+
+    private static readonly Regex[] MagicGiven =
+    [
+        new Regex(@"^Critical hit! You [\w]+ (?<name>.+) for (?<points>\d+) point.* with .+$", RegexOptions.Compiled),
+        new Regex(@"^You [\w]+ (?<name>.+) for (?<points>\d+) point.* with .+$", RegexOptions.Compiled),
+    ];
+
+    private static readonly Regex AetheriaSurge =
+        new(@"^Aetheria surges on (?<name>.+) with the ", RegexOptions.Compiled);
+
+    private bool TryParseAetheriaSurge(string text)
+    {
+        if (!text.StartsWith("Aetheria surges on ", StringComparison.Ordinal))
+            return false;
+        Match m = AetheriaSurge.Match(text);
+        if (!m.Success)
+            return false;
+        RecordAetheriaSurge(m.Groups["name"].Value);
+        return true;
+    }
+
+    private bool TryParseCloakSurge(string text)
+    {
+        // Cloak surges are tracked as one total under a synthetic monster key.
+        if (text.StartsWith("Your cloak", StringComparison.Ordinal) || text.Contains("Shroud of Darkness"))
+        {
+            RecordCloakSurge("__cloak_surges__");
+            return true;
+        }
+        return false;
+    }
+
+    private static bool TryMatchPatterns(Regex[] patterns, string text, out string name, out int points)
+    {
+        foreach (Regex rx in patterns)
+        {
+            Match m = rx.Match(text);
+            if (m.Success)
+            {
+                name = m.Groups["name"].Value;
+                int.TryParse(m.Groups["points"].Value, out points);
+                return true;
+            }
+        }
+        name = string.Empty;
+        points = 0;
+        return false;
+    }
+
+    private static DamageElement GetElementFromText(string text)
+    {
+        if (text.Contains("slash") || text.Contains(" cut") || text.Contains(" scratch") || text.Contains(" mangle"))
+            return DamageElement.Slash;
+        if (text.Contains("pierc") || text.Contains(" gore") || text.Contains(" impale") || text.Contains(" nick") || text.Contains(" stab"))
+            return DamageElement.Pierce;
+        if (text.Contains("bludge") || text.Contains(" smash") || text.Contains(" bash") || text.Contains(" graze") || text.Contains(" crush"))
+            return DamageElement.Bludgeon;
+        if (text.Contains("fire") || text.Contains(" burn") || text.Contains(" singe") || text.Contains(" scorch") || text.Contains(" incinerate"))
+            return DamageElement.Fire;
+        if (text.Contains("cold") || text.Contains(" frost") || text.Contains(" chill") || text.Contains(" numb") || text.Contains(" freeze"))
+            return DamageElement.Cold;
+        if (text.Contains("acid") || text.Contains(" blister") || text.Contains(" sear") || text.Contains(" corrode") || text.Contains(" dissolve"))
+            return DamageElement.Acid;
+        if (text.Contains("electric") || text.Contains(" lightning") || text.Contains(" jolt") || text.Contains(" shock") || text.Contains(" spark") || text.Contains(" blast"))
+            return DamageElement.Electric;
+        if (text.Contains(" eradicate") || text.Contains(" wither") || text.Contains(" scar") || text.Contains(" twist"))
+            return DamageElement.Typeless;
+        if (text.Contains(" deplete") || text.Contains(" siphon") || text.Contains(" exhaust") || text.Contains(" drain") || text.Contains(" lose ") || text.Contains(" health "))
+            return DamageElement.Typeless;
+        return DamageElement.Unknown;
+    }
+
+    private static bool IsNonCombatChat(string text)
+    {
+        if (text.StartsWith("<Tell:", StringComparison.Ordinal) || text.StartsWith('['))
+            return true;
+        if (text.StartsWith("You say,", StringComparison.Ordinal) || text.StartsWith("You tell ", StringComparison.Ordinal))
+            return true;
+        if (text.Contains(" tells you,") || text.Contains(" says,"))
+            return true;
+        return false;
+    }
+
+    // ── Sending ──
+
+    /// <summary>The ten-second send: one snapshot when anything changed since the last.</summary>
+    internal void OnSendTick()
+    {
+        if (!_dirty)
+            return;
+        _dirty = false;
+
+        var payload = new
+        {
+            type = "combat_stats",
+            timestamp = Wire.Timestamp(_context.Clock),
+            character_name = _context.CharacterName,
+            session_id = _context.ConnectionSessionId ?? "",
+            session = _sessionState,
+            lifetime = (object?)null,
+        };
+        _context.Send(payload);
+    }
+}

src/OpenAC.MosswartMassacre/Trackers/KillTracker.cs

@@ -0,0 +1,119 @@
+using System.Text.RegularExpressions;
+using OpenAC.MosswartMassacre.Infrastructure;
+
+namespace OpenAC.MosswartMassacre.Trackers;
+
+/// <summary>
+/// Kills, deaths and kill rate for the session, from the player's own kill
+/// messages. The pattern list is the original's, unchanged.
+/// </summary>
+internal sealed class KillTracker(IClock clock)
+{
+    // Kill message patterns, preserved exactly.
+    internal static readonly string[] KillPatterns =
+    [
+        @"^You flatten (?<targetname>.+)'s body with the force of your assault!$",
+        @"^You bring (?<targetname>.+) to a fiery end!$",
+        @"^You beat (?<targetname>.+) to a lifeless pulp!$",
+        @"^You smite (?<targetname>.+) mightily!$",
+        @"^You obliterate (?<targetname>.+)!$",
+        @"^You run (?<targetname>.+) through!$",
+        @"^You reduce (?<targetname>.+) to a sizzling, oozing mass!$",
+        @"^You knock (?<targetname>.+) into next Morningthaw!$",
+        @"^You split (?<targetname>.+) apart!$",
+        @"^You cleave (?<targetname>.+) in twain!$",
+        @"^You slay (?<targetname>.+) viciously enough to impart death several times over!$",
+        @"^You reduce (?<targetname>.+) to a drained, twisted corpse!$",
+        @"^Your killing blow nearly turns (?<targetname>.+) inside-out!$",
+        @"^Your attack stops (?<targetname>.+) cold!$",
+        @"^Your lightning coruscates over (?<targetname>.+)'s mortal remains!$",
+        @"^Your assault sends (?<targetname>.+) to an icy death!$",
+        @"^You killed (?<targetname>.+)!$",
+        @"^The thunder of crushing (?<targetname>.+) is followed by the deafening silence of death!$",
+        @"^The deadly force of your attack is so strong that (?<targetname>.+)'s ancestors feel it!$",
+        @"^(?<targetname>.+)'s seared corpse smolders before you!$",
+        @"^(?<targetname>.+) is reduced to cinders!$",
+        @"^(?<targetname>.+) is shattered by your assault!$",
+        @"^(?<targetname>.+) catches your attack, with dire consequences!$",
+        @"^(?<targetname>.+) is utterly destroyed by your attack!$",
+        @"^(?<targetname>.+) suffers a frozen fate!$",
+        @"^(?<targetname>.+)'s perforated corpse falls before you!$",
+        @"^(?<targetname>.+) is fatally punctured!$",
+        @"^(?<targetname>.+)'s death is preceded by a sharp, stabbing pain!$",
+        @"^(?<targetname>.+) is torn to ribbons by your assault!$",
+        @"^(?<targetname>.+) is liquified by your attack!$",
+        @"^(?<targetname>.+)'s last strength dissolves before you!$",
+        @"^Electricity tears (?<targetname>.+) apart!$",
+        @"^Blistered by lightning, (?<targetname>.+) falls!$",
+        @"^(?<targetname>.+)'s last strength withers before you!$",
+        @"^(?<targetname>.+) is dessicated by your attack!$",
+        @"^(?<targetname>.+) is incinerated by your assault!$",
+    ];
+
+    private static readonly Regex[] Compiled =
+        [.. KillPatterns.Select(pattern => new Regex(pattern, RegexOptions.Compiled))];
+
+    public int TotalKills { get; private set; }
+
+    public double KillsPerHour { get; private set; }
+
+    public double KillsPer5Min { get; private set; }
+
+    public int SessionDeaths { get; private set; }
+
+    public int TotalDeaths { get; private set; }
+
+    public DateTime StatsStartTime { get; private set; } = clock.Now;
+
+    public DateTime LastKillTime { get; private set; } = clock.Now;
+
+    public int RareCount { get; set; }
+
+    /// <summary>Counts a kill when <paramref name="text"/> is one of the player's kill messages.</summary>
+    public bool CheckForKill(string text)
+    {
+        if (!IsKilledByMeMessage(text))
+            return false;
+        TotalKills++;
+        LastKillTime = clock.Now;
+        CalculateKillsPerInterval();
+        return true;
+    }
+
+    public void OnDeath() => SessionDeaths++;
+
+    public void SetTotalDeaths(int totalDeaths) => TotalDeaths = totalDeaths;
+
+    public void RestartStats()
+    {
+        TotalKills = 0;
+        RareCount = 0;
+        SessionDeaths = 0;
+        StatsStartTime = clock.Now;
+        KillsPer5Min = 0;
+        KillsPerHour = 0;
+    }
+
+    /// <summary>The once-a-second refresh the original ran on its stats timer.</summary>
+    public void Update() => CalculateKillsPerInterval();
+
+    private void CalculateKillsPerInterval()
+    {
+        double minutesElapsed = (clock.Now - StatsStartTime).TotalMinutes;
+        if (minutesElapsed > 0)
+        {
+            KillsPer5Min = (TotalKills / minutesElapsed) * 5;
+            KillsPerHour = (TotalKills / minutesElapsed) * 60;
+        }
+    }
+
+    private static bool IsKilledByMeMessage(string text)
+    {
+        foreach (Regex pattern in Compiled)
+        {
+            if (pattern.IsMatch(text))
+                return true;
+        }
+        return false;
+    }
+}

src/OpenAC.MosswartMassacre/Trackers/RareTracker.cs

@@ -0,0 +1,48 @@
+using System.Text.RegularExpressions;
+using OpenAC.MosswartMassacre.Backend;
+using OpenAC.MosswartMassacre.Infrastructure;
+
+namespace OpenAC.MosswartMassacre.Trackers;
+
+/// <summary>
+/// The player's own rare discoveries: counts them, announces the rare in
+/// allegiance chat three seconds later and sends the <c>rare</c> frame. (The
+/// original could also switch the bot's meta state on a rare; that is not
+/// carried over.)
+/// </summary>
+internal sealed class RareTracker(MmContext context, DelayedCommands delayed)
+{
+    private static readonly Regex RarePattern =
+        new(@"^(?<name>['A-Za-z ]+)\shas discovered the (?<item>.*?)!$", RegexOptions.Compiled);
+
+    public int RareCount { get; set; }
+
+    public bool CheckForRare(string text, out string? rareText)
+    {
+        rareText = null;
+        Match match = RarePattern.Match(text);
+        if (!match.Success || match.Groups["name"].Value != context.CharacterName)
+            return false;
+
+        rareText = match.Groups["item"].Value;
+        RareCount++;
+        delayed.Add($"/a {rareText}", 3000);
+        SendRare(rareText);
+        return true;
+    }
+
+    private void SendRare(string rare)
+    {
+        MmCoordinates coords = MmCoordinates.From(context.Automation.Navigation.Snapshot.Position);
+        context.Send(new
+        {
+            type = "rare",
+            timestamp = Wire.Timestamp(context.Clock),
+            character_name = context.CharacterName,
+            name = rare,
+            ew = coords.EW,
+            ns = coords.NS,
+            z = coords.Z,
+        });
+    }
+}

tests/OpenAC.MosswartMassacre.Tests/Streams/StreamGoldenTests.cs

@@ -0,0 +1,329 @@
+using System.Globalization;
+using AcDream.Plugin.Abstractions;
+using OpenAC.MosswartMassacre.Streams;
+using OpenAC.MosswartMassacre.Trackers;
+
+namespace OpenAC.MosswartMassacre.Tests.Streams;
+
+/// <summary>
+/// The exact frames the original plugin sent, one per type in this slice. Each
+/// expected string is derived by hand from the original source (file and lines
+/// cited per test); field order, JSON types and number formats are the
+/// contract with the backend.
+/// </summary>
+public sealed class StreamGoldenTests
+{
+    // Clock of the harness: UTC 2026-09-25 08:30:15.123, local 10:30:15.123.
+    private const string Stamp = "2026-09-25T08:30:15.1230000Z";
+
+    /// <summary>
+    /// A position in landblock 0xA9B4 whose local floats are exact binary
+    /// fractions, so the original's float arithmetic is easy to follow:
+    /// x = 96 -> EW = ((96/24) + 169*8 - 1019.5) / 10 = 33.65 as a float;
+    /// y = 120 -> NS = ((120/24) + 180*8 - 1019.5) / 10 = 42.55 as a float;
+    /// z = 42.5.
+    /// </summary>
+    internal static PluginNavigationPosition Position(float x = 96f, float y = 120f, float z = 42.5f, uint cell = 0xA9B40019u)
+    {
+        uint bx = (cell >> 24) & 0xFFu;
+        uint by = (cell >> 16) & 0xFFu;
+        return new PluginNavigationPosition(
+            cell,
+            (((double)bx - 127d) * 192d + x - 84d) / 240d,
+            (((double)by - 127d) * 192d + y - 84d) / 240d,
+            z / 240d,
+            90f,
+            true);
+    }
+
+    private static string D(float value) => ((double)value).ToString("R", CultureInfo.InvariantCulture);
+
+    private static PluginHarness LoggedIn(Action<PluginHarness>? arrange = null)
+    {
+        var harness = new PluginHarness("Mossy");
+        harness.Host.Automation.Navigation.Snapshot = new PluginNavigationSnapshot(true, false, 1u, Position(), false, false);
+        arrange?.Invoke(harness);
+        harness.Login();
+        harness.Frames.Clear();
+        return harness;
+    }
+
+    [Fact]
+    public void Coordinates_follow_the_originals_float_arithmetic()
+    {
+        var coords = OpenAC.MosswartMassacre.Infrastructure.MmCoordinates.From(Position());
+
+        Assert.Equal((double)33.65f, coords.EW);
+        Assert.Equal((double)42.55f, coords.NS);
+        Assert.Equal(42.5, coords.Z);
+        // A float widened to double, not the double 33.65.
+        Assert.NotEqual(33.65, coords.EW);
+    }
+
+    [Fact]
+    public void Coordinates_recover_the_float_local_position_for_awkward_values()
+    {
+        // 97.123f is not an exact binary fraction; the original computed from
+        // exactly this float, and so must the port.
+        var coords = OpenAC.MosswartMassacre.Infrastructure.MmCoordinates.From(Position(x: 97.123f, y: 3.3f));
+
+        Assert.Equal((double)OpenAC.MosswartMassacre.Infrastructure.MmCoordinates.LandblockToEW(0xA9B40019u, 97.123f), coords.EW);
+        Assert.Equal((double)OpenAC.MosswartMassacre.Infrastructure.MmCoordinates.LandblockToNS(0xA9B40019u, 3.3f), coords.NS);
+    }
+
+    [Fact]
+    public void Vitals_frame()
+    {
+        // PluginCore.cs:1062-1106 (SendVitalsUpdate): anonymous type in this
+        // order; percentages Math.Round(.., 1) as double (0 -> 0.0 by the
+        // ternary's double type); vitae an int.
+        using var harness = LoggedIn(h =>
+        {
+            var c = h.Host.Automation.Character;
+            c.CurrentHealth = 150; c.MaxHealth = 200;
+            c.CurrentStamina = 0; c.MaxStamina = 0;
+            c.CurrentMana = 333; c.MaxMana = 999;
+        });
+
+        harness.Feature<VitalsStream>().SendNow();
+
+        Assert.Equal(
+            "{\"type\":\"vitals\",\"timestamp\":\"" + Stamp + "\",\"character_name\":\"Mossy\","
+            + "\"health_current\":150,\"health_max\":200,\"health_percentage\":75.0,"
+            + "\"stamina_current\":0,\"stamina_max\":0,\"stamina_percentage\":0.0,"
+            + "\"mana_current\":333,\"mana_max\":999,\"mana_percentage\":33.3,"
+            + "\"vitae\":0}",
+            Assert.Single(harness.Frames));
+    }
+
+    [Fact]
+    public void Vitals_are_sent_every_five_seconds()
+    {
+        using var harness = LoggedIn();
+
+        harness.Run(10.05);
+
+        Assert.Equal(2, harness.FramesOfType("vitals").Count());
+    }
+
+    [Fact]
+    public void Telemetry_frame()
+    {
+        // WebSocket.cs:476-507 (BuildPayloadJson): ew/ns/z doubles from
+        // Coordinates.Me (float values); kills an int; kills_per_hour F0
+        // string; onlinetime dd.hh:mm:ss; deaths/total_deaths/taper strings;
+        // vt_state string; mem_mb a long (bytes); cpu_pct a float;
+        // mem_handles an int.
+        using var harness = LoggedIn(h =>
+            h.Host.Automation.Objects.Properties[0x50000001] = new PluginItemProperties(
+                new Dictionary<uint, int> { [43] = 7 },
+                new Dictionary<uint, long>(),
+                new Dictionary<uint, bool>(),
+                new Dictionary<uint, double>(),
+                new Dictionary<uint, string>(),
+                new Dictionary<uint, uint>(),
+                new Dictionary<uint, uint>()));
+        harness.Context.PrismaticTaperCount = () => 1234;
+        harness.Context.MetaState = () => "Combat";
+        harness.Context.Settings.Current.CharTag = "tank";
+        harness.Clock.Advance(TimeSpan.FromMinutes(90));
+
+        string json = Newtonsoft.Json.JsonConvert.SerializeObject(harness.Feature<TelemetryStream>().Build());
+        var frame = Newtonsoft.Json.Linq.JObject.Parse(json);
+
+        string[] expectedOrder =
+        [
+            "type", "character_name", "char_tag", "session_id", "timestamp", "ew", "ns", "z", "kills",
+            "kills_per_hour", "onlinetime", "deaths", "total_deaths", "prismatic_taper_count", "vt_state",
+            "mem_mb", "cpu_pct", "mem_handles",
+        ];
+        Assert.Equal(expectedOrder, frame.Properties().Select(p => p.Name));
+
+        string head = "{\"type\":\"telemetry\",\"character_name\":\"Mossy\",\"char_tag\":\"tank\",\"session_id\":\""
+            + MmContext.ProcessSessionId + "\",\"timestamp\":\"2026-09-25T10:00:15.1230000Z\","
+            + "\"ew\":" + D(33.65f) + ",\"ns\":" + D(42.55f) + ",\"z\":42.5,\"kills\":0,"
+            + "\"kills_per_hour\":\"0\",\"onlinetime\":\"00.01:30:00\",\"deaths\":\"0\",\"total_deaths\":\"7\","
+            + "\"prismatic_taper_count\":\"1234\",\"vt_state\":\"Combat\",\"mem_mb\":";
+        Assert.StartsWith(head, json);
+        Assert.Equal(Newtonsoft.Json.Linq.JTokenType.Integer, frame["mem_mb"]!.Type);
+        Assert.Equal(Newtonsoft.Json.Linq.JTokenType.Float, frame["cpu_pct"]!.Type);
+        Assert.Equal(Newtonsoft.Json.Linq.JTokenType.Integer, frame["mem_handles"]!.Type);
+        Assert.Equal(32, ((string)frame["session_id"]!).Length);
+    }
+
+    [Fact]
+    public void Telemetry_goes_out_on_connect_and_then_every_five_seconds()
+    {
+        using var harness = LoggedIn();
+
+        harness.SimulateConnected();
+        Assert.Single(harness.FramesOfType("telemetry"));
+
+        harness.Run(5.05);
+        Assert.Equal(2, harness.FramesOfType("telemetry").Count());
+    }
+
+    [Fact]
+    public void Chat_frame_normalises_the_line()
+    {
+        // ChatEventRouter.cs:68-91 (AllChatText + NormalizeChatLine): tags
+        // stripped, trailing CR/LF trimmed, runs of spaces collapsed; color is
+        // the line's text class.
+        using var harness = LoggedIn();
+
+        harness.Host.Automation.Chat.Deliver("Hello   there", kind: 0, sender: "Horan", logTextType: 2, senderObjectId: 0x50000002);
+
+        Assert.Equal(
+            "{\"type\":\"chat\",\"timestamp\":\"" + Stamp + "\",\"character_name\":\"Mossy\","
+            + "\"text\":\"Horan says, \\\"Hello there\\\"\",\"color\":2}",
+            Assert.Single(harness.Frames));
+    }
+
+    [Fact]
+    public void Spawn_frame_has_string_coordinates()
+    {
+        // PluginCore.cs:838-895 + WebSocket.cs:290-304: ns/ew F7 invariant
+        // strings, z F2 string (landblock-local metres).
+        using var harness = LoggedIn();
+
+        harness.Host.Events.RaiseObjectChanged(new PluginObjectChange(0x80001234, PluginObjectChangeKind.Created)
+        {
+            Current = new PluginWorldObject(0x80001234, 1, "Drudge Skulker", PluginObjectClass.Monster, 16, 0, 0)
+            {
+                HasPosition = true,
+                Position = Position(x: 96f, y: 120f, z: 12.25f),
+            },
+        });
+
+        Assert.Equal(
+            "{\"type\":\"spawn\",\"timestamp\":\"" + Stamp + "\",\"character_name\":\"Mossy\","
+            + "\"mob\":\"Drudge Skulker\",\"ns\":\"42.5500000\",\"ew\":\"33.6500000\",\"z\":\"12.25\"}",
+            Assert.Single(harness.Frames));
+    }
+
+    [Fact]
+    public void Portal_frame_only_within_240_metres()
+    {
+        // PluginCore.cs:897-961: flat distance > 240 m -> skipped.
+        using var harness = LoggedIn();
+        PluginWorldObject Portal(uint id, PluginNavigationPosition p) =>
+            new(id, 1, "Portal to Holtburg", PluginObjectClass.Portal, 0x10000, 0, 0) { HasPosition = true, Position = p };
+
+        harness.Host.Events.RaiseObjectChanged(new PluginObjectChange(1, PluginObjectChangeKind.Created)
+        {
+            Current = Portal(1, Position(x: 180f, y: 120f, z: 1f)),
+        });
+        harness.Host.Events.RaiseObjectChanged(new PluginObjectChange(2, PluginObjectChangeKind.Created)
+        {
+            Current = Portal(2, Position(x: 96f, y: 120f, z: 1f, cell: 0xABB40019u)),
+        });
+
+        Assert.Equal(
+            "{\"type\":\"portal\",\"timestamp\":\"" + Stamp + "\",\"character_name\":\"Mossy\","
+            + "\"portal_name\":\"Portal to Holtburg\",\"ns\":\"42.5500000\",\"ew\":\"34.0000000\",\"z\":\"1.00\"}",
+            Assert.Single(harness.Frames));
+    }
+
+    [Fact]
+    public void Rare_frame_has_number_coordinates_and_announces_in_allegiance_later()
+    {
+        // RareTracker.cs:31-47 + WebSocket.cs:321-337: name = the item text,
+        // ew/ns/z numbers from Coordinates.Me; "/a <item>" 3 s later.
+        using var harness = LoggedIn();
+
+        harness.Host.Automation.Chat.Deliver("Mossy has discovered the Pearl of Blood Drinking!", kind: 4, logTextType: 0);
+
+        Assert.Equal(
+            "{\"type\":\"rare\",\"timestamp\":\"" + Stamp + "\",\"character_name\":\"Mossy\","
+            + "\"name\":\"Pearl of Blood Drinking\",\"ew\":" + D(33.65f) + ",\"ns\":" + D(42.55f) + ",\"z\":42.5}",
+            harness.Frames[0]);
+        Assert.Equal("chat", (string?)Newtonsoft.Json.Linq.JObject.Parse(harness.Frames[1])["type"]);
+
+        harness.Run(2.9);
+        Assert.Empty(harness.Host.Automation.Chat.Submitted);
+        harness.Run(0.2);
+        Assert.Equal(["/a Pearl of Blood Drinking"], harness.Host.Automation.Chat.Submitted);
+    }
+
+    [Fact]
+    public void Another_players_rare_is_not_counted()
+    {
+        using var harness = LoggedIn();
+
+        harness.Host.Automation.Chat.Deliver("Horan has discovered the Pearl of Blood Drinking!", kind: 4);
+
+        Assert.Empty(harness.FramesOfType("rare"));
+    }
+
+    [Fact]
+    public void Combat_stats_frame()
+    {
+        // CombatStatsTracker.cs:520-550 + CombatInfo.cs: session is the
+        // CombatSessionState fields (snake_case) then Newtonsoft also writes
+        // each monster's public aggregate getters (PascalCase); enum keys by
+        // name; lifetime null; session_id the per-connection id.
+        using var harness = LoggedIn();
+        harness.SimulateConnected();
+        harness.Frames.Clear();
+        var tracker = harness.Feature<CombatStatsTracker>();
+
+        harness.Host.Automation.Chat.Deliver("You slash Drudge Skulker for 25 points of slashing damage!", kind: 8, logTextType: 6);
+        harness.Frames.Clear();
+        tracker.OnSendTick();
+
+        string sessionStart = tracker.Session.SessionStart;
+        Assert.Equal(
+            "{\"type\":\"combat_stats\",\"timestamp\":\"" + Stamp + "\",\"character_name\":\"Mossy\","
+            + "\"session_id\":\"Mossy-20260925-083015\","
+            + "\"session\":{\"total_damage_given\":25,\"total_damage_received\":0,\"total_kills\":0,"
+            + "\"total_aetheria_surges\":0,\"total_cloak_surges\":0,\"session_start\":\"" + sessionStart + "\","
+            + "\"monsters\":{\"Drudge Skulker\":{\"name\":\"Drudge Skulker\",\"kill_count\":0,\"damage_given\":25,"
+            + "\"damage_received\":0,\"aetheria_surges\":0,\"cloak_surges\":0,"
+            + "\"offense\":{\"MeleeMissile\":{\"Slash\":{\"total_attacks\":1,\"failed_attacks\":0,\"crits\":0,"
+            + "\"total_normal_damage\":25,\"max_normal_damage\":25,\"total_crit_damage\":0,\"max_crit_damage\":0,"
+            + "\"killing_blows\":0,\"damage\":25}}},\"defense\":{},"
+            + "\"TotalOffenseAttacks\":1,\"TotalOffenseFailedAttacks\":0,\"TotalOffenseCrits\":0,"
+            + "\"TotalOffenseNormalDamage\":25,\"MaxOffenseNormalDamage\":25,\"TotalOffenseCritDamage\":0,"
+            + "\"MaxOffenseCritDamage\":0,\"TotalDefenseAttacks\":0,\"TotalDefenseFailedAttacks\":0}}},"
+            + "\"lifetime\":null}",
+            Assert.Single(harness.Frames));
+
+        // Nothing changed since: no frame.
+        harness.Frames.Clear();
+        tracker.OnSendTick();
+        Assert.Empty(harness.Frames);
+    }
+
+    [Fact]
+    public void Kills_count_from_kill_messages_and_the_report_answers_in_allegiance()
+    {
+        using var harness = LoggedIn();
+        var stats = harness.Feature<SessionStats>();
+
+        harness.Host.Automation.Chat.Deliver("You killed Drudge Skulker!", kind: 8, logTextType: 6);
+        harness.Host.Automation.Chat.Deliver("Drudge Skulker is torn to ribbons by your assault!", kind: 8, logTextType: 6);
+        Assert.Equal(2, stats.Kills.TotalKills);
+
+        harness.Host.Automation.Chat.Deliver("!report", kind: 2, sender: "Horan", channelName: "Allegiance", logTextType: 18);
+
+        string report = Assert.Single(harness.Host.Automation.Chat.Submitted);
+        Assert.StartsWith("/a Total Kills: 2, Kills per Hour: ", report);
+        Assert.EndsWith(", Elapsed Time: 00.00:00:00, Rares Found: 0", report);
+    }
+
+    [Fact]
+    public void Death_counts_a_session_death_and_rereads_total_deaths()
+    {
+        using var harness = LoggedIn();
+        var stats = harness.Feature<SessionStats>();
+        harness.Host.Automation.Objects.Properties[0x50000001] = new PluginItemProperties(
+            new Dictionary<uint, int> { [43] = 12 },
+            new Dictionary<uint, long>(), new Dictionary<uint, bool>(), new Dictionary<uint, double>(),
+            new Dictionary<uint, string>(), new Dictionary<uint, uint>(), new Dictionary<uint, uint>());
+
+        harness.Host.Events.RaiseLocalPlayerDied("You died.");
+
+        Assert.Equal(1, stats.Kills.SessionDeaths);
+        Assert.Equal(12, stats.Kills.TotalDeaths);
+    }
+}