diff --git a/.voidbot/state/aetheria.cc b/.voidbot/state/aetheria.cc
index d627d6c65..1b405ae20 100644
Binary files a/.voidbot/state/aetheria.cc and b/.voidbot/state/aetheria.cc differ
diff --git a/Aetheria.State/README.md b/Aetheria.State/README.md
index 3071b78a7..d201cfd54 100644
--- a/Aetheria.State/README.md
+++ b/Aetheria.State/README.md
@@ -126,9 +126,9 @@ persist hull simulation grids into `AetheriaEntitySnapshot`, so
 `RuntimeEntityBlueprint` is no longer the only surface carrying those live
 values. Broader runtime object graphs, typed behavior factory construction, and
 behavior-private simulation state remain legacy until dedicated typed runtime
-documents exist. Live behavior instances expose typed behavior kind through
-`Behavior.Kind`; the remaining `BehaviorData` objects are construction configs,
-not runtime identity owners.
+documents exist. Live behavior instances expose typed behavior kind and group
+through `Behavior.Kind` and `Behavior.Group`; the remaining `BehaviorData`
+objects are construction configs, not runtime identity owners.
 Typed name-file documents are `aetheria.name_file.v2` records. They carry the
 legacy ID, display name, count, compact sample names for surfaces, and the full
 name array needed to move `Galaxy`/Markov name generation off legacy
diff --git a/Assets/Scripts/ServerShared/Behaviors/Behaviors.cs b/Assets/Scripts/ServerShared/Behaviors/Behaviors.cs
index fd0424373..65d6b0dd9 100644
--- a/Assets/Scripts/ServerShared/Behaviors/Behaviors.cs
+++ b/Assets/Scripts/ServerShared/Behaviors/Behaviors.cs
@@ -14,6 +14,7 @@ public abstract class Behavior
 {
     public BehaviorData Data { get; }
     public string Kind { get; }
+    public int Group { get; }
     public EquippedItem Item { get; }
     private ConsumableItemEffect Consumable { get; }
     protected ItemManager ItemManager { get; }
@@ -47,6 +48,7 @@ public abstract class Behavior
     {
         Data = data;
         Kind = data?.Kind ?? "";
+        Group = data?.Group ?? 0;
         Item = item;
         ItemManager = Item.ItemManager;
     }
@@ -55,6 +57,7 @@ public abstract class Behavior
     {
         Data = data;
         Kind = data?.Kind ?? "";
+        Group = data?.Group ?? 0;
         Consumable = consumable;
         ItemManager = consumable.Entity.ItemManager;
     }
diff --git a/Assets/Scripts/ServerShared/Entity.cs b/Assets/Scripts/ServerShared/Entity.cs
index 17d658ef5..71bf00f45 100644
--- a/Assets/Scripts/ServerShared/Entity.cs
+++ b/Assets/Scripts/ServerShared/Entity.cs
@@ -1395,7 +1395,7 @@ public class EquippedItem
         Behaviors = ItemManager.CreateRuntimeBehaviors(this);
 
         BehaviorGroups = Behaviors
-            .GroupBy(b => b.Data.Group)
+            .GroupBy(b => b.Group)
             .OrderBy(g => g.Key)
             .ToDictionary(g => g.Key, g => new BehaviorGroup
             {
diff --git a/docs/aetheria-perfect-machine-map.md b/docs/aetheria-perfect-machine-map.md
index 297d7705d..7172e809a 100644
--- a/docs/aetheria-perfect-machine-map.md
+++ b/docs/aetheria-perfect-machine-map.md
@@ -618,9 +618,9 @@ legacy catalog cache, and legacy UI paths should be migration-only or deleted.
   type selection now uses an explicit runtime catalog map instead of
   `UnionAttribute` reflection, and the temporary behavior config constructor
   map is keyed by typed behavior payload kind rather than legacy union key.
-  Live `Behavior` instances expose their typed payload kind directly, so runtime
-  state projection and stat-modifier matching no longer reach back through
-  `BehaviorData.Kind` for behavior identity.
+  Live `Behavior` instances expose their typed payload kind and group directly,
+  so runtime state projection, stat-modifier matching, and behavior grouping no
+  longer reach back through `BehaviorData` for behavior identity.
   Runtime item category classification uses package-owned
   `AetheriaRuntimeItemCategories` tokens; gameplay code should not ask C#
   legacy DTO class names to classify typed catalog rows. The typed state
@@ -991,8 +991,9 @@ First Aetheria surfaces to publish:
      `AetheriaRuntimeBehaviorMetadataCatalog`; the behavior only normalizes
      migrated `*Data` tokens before asking the package-owned metadata owner.
    - Done: move live behavior identity reads from the temporary `BehaviorData`
-     config bridge onto `Behavior.Kind`, so state snapshots, weapon snapshots,
-     progress rows, and stat-modifier matching use runtime instance identity.
+     config bridge onto `Behavior.Kind` and `Behavior.Group`, so state
+     snapshots, weapon snapshots, progress rows, stat-modifier matching, and
+     behavior grouping use runtime instance identity.
    - Done: delete the legacy `Behaviors` lists from `ConsumableItemData` and
      `EquippableItemData`; item DTOs can no longer carry behavior config state.
    - Done: move runtime blueprint price aggregation and conductivity restore