diff --git a/src/AcDream.Core.Net/Messages/PlayerDescriptionParser.cs b/src/AcDream.Core.Net/Messages/PlayerDescriptionParser.cs
index 2e040b0..a6206f2 100644
--- a/src/AcDream.Core.Net/Messages/PlayerDescriptionParser.cs
+++ b/src/AcDream.Core.Net/Messages/PlayerDescriptionParser.cs
@@ -393,6 +393,11 @@ public static class PlayerDescriptionParser
                             desiredComps.Add((id, amt));
                         }
                     }
+
+                    // holtburger events.rs:576-582 — spellbook_filters is optional; defaults
+                    // to 0 if EOF.
+                    if (payload.Length - pos >= 4)
+                        spellbookFilters = ReadU32(payload, ref pos);
                 }
             }
             catch (FormatException ex)
diff --git a/tests/AcDream.Core.Net.Tests/PlayerDescriptionParserTests.cs b/tests/AcDream.Core.Net.Tests/PlayerDescriptionParserTests.cs
index 418c586..0fd852e 100644
--- a/tests/AcDream.Core.Net.Tests/PlayerDescriptionParserTests.cs
+++ b/tests/AcDream.Core.Net.Tests/PlayerDescriptionParserTests.cs
@@ -566,4 +566,31 @@ public sealed class PlayerDescriptionParserTests
         Assert.Equal((0xAAu, 50u), parsed.Value.DesiredComps[0]);
         Assert.Equal((0xBBu, 75u), parsed.Value.DesiredComps[1]);
     }
+
+    [Fact]
+    public void TryParse_TrailerSpellbookFilters_ReadOptionalU32()
+    {
+        var sb = new MemoryStream();
+        using var writer = new BinaryWriter(sb);
+        writer.Write(0u);               // propertyFlags
+        writer.Write(0x52u);             // weenieType
+        writer.Write(0x201u);            // ATTRIBUTE | ENCHANTMENT
+        writer.Write(1u);                // has_health
+        writer.Write(0u);                // empty attribute_flags
+        writer.Write(0u);                // empty enchantment mask
+
+        writer.Write(0u);                // option_flags = None
+        writer.Write(0u);                // options1
+
+        // Legacy hotbar list: count=0
+        writer.Write(0u);
+
+        // spellbook_filters sentinel.
+        writer.Write(0xF00DBA42u);
+
+        var parsed = PlayerDescriptionParser.TryParse(sb.ToArray());
+
+        Assert.NotNull(parsed);
+        Assert.Equal(0xF00DBA42u, parsed!.Value.SpellbookFilters);
+    }
 }