diff --git a/src/AcDream.Core/Items/ClientObjectTable.cs b/src/AcDream.Core/Items/ClientObjectTable.cs
index 356fa7b6..5ed850a8 100644
--- a/src/AcDream.Core/Items/ClientObjectTable.cs
+++ b/src/AcDream.Core/Items/ClientObjectTable.cs
@@ -163,6 +163,32 @@ public sealed class ClientObjectTable
         return true;
     }
 
+    /// <summary>
+    /// Apply a <see cref="PropertyBundle"/> patch, creating the object if it does not
+    /// exist yet. Used for the local player's own properties from PlayerDescription
+    /// (0x0013), which may arrive BEFORE the player's CreateObject — unlike
+    /// <see cref="UpdateProperties"/>, which no-ops on an unknown object. Fires
+    /// ObjectAdded on create, else ObjectUpdated.
+    /// </summary>
+    public void UpsertProperties(uint guid, PropertyBundle incoming)
+    {
+        ArgumentNullException.ThrowIfNull(incoming);
+        bool existed = _objects.TryGetValue(guid, out var item);
+        if (!existed || item is null)
+        {
+            item = new ClientObject { ObjectId = guid };
+            _objects[guid] = item;
+        }
+        foreach (var kv in incoming.Ints)        item.Properties.Ints[kv.Key] = kv.Value;
+        foreach (var kv in incoming.Int64s)      item.Properties.Int64s[kv.Key] = kv.Value;
+        foreach (var kv in incoming.Bools)       item.Properties.Bools[kv.Key] = kv.Value;
+        foreach (var kv in incoming.Floats)      item.Properties.Floats[kv.Key] = kv.Value;
+        foreach (var kv in incoming.Strings)     item.Properties.Strings[kv.Key] = kv.Value;
+        foreach (var kv in incoming.DataIds)     item.Properties.DataIds[kv.Key] = kv.Value;
+        foreach (var kv in incoming.InstanceIds) item.Properties.InstanceIds[kv.Key] = kv.Value;
+        if (!existed) ObjectAdded?.Invoke(item); else ObjectUpdated?.Invoke(item);
+    }
+
     /// <summary>
     /// Apply a single PropertyInt update (from PublicUpdatePropertyInt 0x02CE) to an
     /// object: store it in the bundle and, for known typed ints, mirror to the typed
diff --git a/tests/AcDream.Core.Tests/Items/ClientObjectTableUpdateTests.cs b/tests/AcDream.Core.Tests/Items/ClientObjectTableUpdateTests.cs
new file mode 100644
index 00000000..b5ec1c78
--- /dev/null
+++ b/tests/AcDream.Core.Tests/Items/ClientObjectTableUpdateTests.cs
@@ -0,0 +1,41 @@
+using AcDream.Core.Items;
+using Xunit;
+
+namespace AcDream.Core.Tests.Items;
+
+public sealed class ClientObjectTableUpdateTests
+{
+    [Fact]
+    public void UpsertProperties_unknownObject_createsThenMerges()
+    {
+        var t = new ClientObjectTable();
+        bool added = false;
+        t.ObjectAdded += _ => added = true;
+
+        var bundle = new PropertyBundle();
+        bundle.Ints[5] = 1234;     // EncumbranceVal
+
+        t.UpsertProperties(0x50000001u, bundle);
+
+        var o = t.Get(0x50000001u);
+        Assert.NotNull(o);
+        Assert.Equal(1234, o!.Properties.Ints[5]);
+        Assert.True(added);
+    }
+
+    [Fact]
+    public void UpsertProperties_existingObject_mergesAndFiresUpdated()
+    {
+        var t = new ClientObjectTable();
+        t.AddOrUpdate(new ClientObject { ObjectId = 0x50000001u });
+        bool updated = false;
+        t.ObjectUpdated += _ => updated = true;
+
+        var bundle = new PropertyBundle();
+        bundle.Ints[5] = 99;
+        t.UpsertProperties(0x50000001u, bundle);
+
+        Assert.Equal(99, t.Get(0x50000001u)!.Properties.Ints[5]);
+        Assert.True(updated);
+    }
+}