diff --git a/.voidbot/state/aetheria.cc b/.voidbot/state/aetheria.cc
index d8c987116..7fa34ad75 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 3bfccef3a..0bd6b6067 100644
--- a/Aetheria.State/README.md
+++ b/Aetheria.State/README.md
@@ -85,8 +85,8 @@ been deleted from live Unity source. Surviving runtime DTOs no longer carry
 legacy catalog group/table annotations; their remaining metadata is projection
 and inspection metadata for the typed runtime bridge.
 Item instances now carry `AetheriaRuntimeItemReference`, a typed item-key
-facade. `ItemInstance.ItemKey` is the identity surface, while `ItemId` is a
-derived legacy-GUID compatibility projection for broader simulation paths.
+facade. `ItemInstance.ItemKey` is the identity surface; the old `ItemId`
+legacy-GUID projection has been deleted from item instances.
 Cargo inventory indexes, consumable activation lookup, action-bar consumable
 quantity/fill, transfer lookup, trade owned counts, weapon ammo references, and
 item-use behavior references now use item keys. The old derived behavior
diff --git a/Assets/Scripts/ServerShared/Entity.cs b/Assets/Scripts/ServerShared/Entity.cs
index 75b6afd84..f1be5746e 100644
--- a/Assets/Scripts/ServerShared/Entity.cs
+++ b/Assets/Scripts/ServerShared/Entity.cs
@@ -264,7 +264,7 @@ public abstract class Entity
         Hull = hull;
         var typedHull = itemManager.GetRuntimeItem(hull);
         if (typedHull == null)
-            throw new InvalidOperationException($"Unable to construct entity: missing typed hull row for {hull?.ItemId}");
+            throw new InvalidOperationException($"Unable to construct entity: missing typed hull row for {hull?.ItemKey}");
         Name = typedHull.Name;
         MapEntity();
         WeaponGroups = new (List<Weapon> weapons, List<EquippedItem> items)[itemManager.GameplaySettings.WeaponGroupCount];
@@ -354,7 +354,7 @@ public abstract class Entity
     {
         var typedHull = ItemManager.GetRuntimeItem(Hull);
         if (typedHull == null)
-            throw new InvalidOperationException($"Unable to map entity {Name}: missing typed hull row for {Hull?.ItemId}");
+            throw new InvalidOperationException($"Unable to map entity {Name}: missing typed hull row for {Hull?.ItemKey}");
 
         var hullShape = GetHullShape(typedHull);
         EquippedHull = new EquippedItem(ItemManager, Hull, int2.zero, this);
diff --git a/Assets/Scripts/ServerShared/ItemInstance.cs b/Assets/Scripts/ServerShared/ItemInstance.cs
index 6c13c7941..7d6f5d110 100644
--- a/Assets/Scripts/ServerShared/ItemInstance.cs
+++ b/Assets/Scripts/ServerShared/ItemInstance.cs
@@ -2,7 +2,6 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
-using System;
 using System.Collections;
 using System.Collections.Generic;
 using System.Linq;
@@ -16,7 +15,6 @@ public abstract class ItemInstance
     public ItemRotation Rotation;
 
     public string ItemKey => Reference?.ItemKey ?? "";
-    public Guid ItemId => Reference?.LegacyItemId ?? Guid.Empty;
 }
 
 public abstract class CraftedItemInstance : ItemInstance
diff --git a/Assets/Scripts/ServerShared/ItemManager.cs b/Assets/Scripts/ServerShared/ItemManager.cs
index 9645cc16e..69224c062 100644
--- a/Assets/Scripts/ServerShared/ItemManager.cs
+++ b/Assets/Scripts/ServerShared/ItemManager.cs
@@ -598,7 +598,7 @@ public class ItemManager
         var durability = pow(item.Durability / maxDurability, durabilityExponent * stat.DurabilityExponentMultiplier);
         var result = lerp(stat.Min, stat.Max, quality * durability);
         if (float.IsNaN(result)) 
-            throw new InvalidOperationException($"Performance Stat on {typedItem?.Name ?? item.ItemId.ToString()} evaluating as NaN: input data is invalid! Durability: {item.Durability} / {maxDurability}");
+            throw new InvalidOperationException($"Performance Stat on {typedItem?.Name ?? item.ItemKey} evaluating as NaN: input data is invalid! Durability: {item.Durability} / {maxDurability}");
         return result;
 
     }
@@ -647,7 +647,7 @@ public class ItemManager
         var typedItem = GetRuntimeItem(item);
         if (typedItem == null)
         {
-            _logger($"Attempted to instantiate missing item id {item?.ItemId}");
+            _logger($"Attempted to instantiate missing item key {item?.ItemKey}");
             return null;
         }
 
diff --git a/docs/aetheria-perfect-machine-map.md b/docs/aetheria-perfect-machine-map.md
index b054b81f1..d4538e3c5 100644
--- a/docs/aetheria-perfect-machine-map.md
+++ b/docs/aetheria-perfect-machine-map.md
@@ -1227,6 +1227,8 @@ First Aetheria surfaces to publish:
      references, item-use behavior references, and runtime commit item/hull
      surfaces now carry typed item keys; remaining broader simulation paths
      still derive legacy GUIDs until those structures move to typed keys.
+   - Done: delete the `ItemInstance.ItemId` legacy-GUID projection; diagnostics
+     now report `ItemKey` so item instances expose only typed item-key identity.
    - Remove runtime dependency on `ItemData` DTOs as item instance owners.
 
 5. Mesh host