Small error in how mouse events are processed. I need to do them _outside_ of the guecs::UI so that the event is checked once and then confirmed in all grids. Then created a tombstone device to be used as a dead enemy marker that will later allow looting.

assets/devices.json

@@ -49,5 +49,21 @@
         "events": ["Events::GUI::TRAP"]},
       {"_type": "Sprite", "name": "tripwire_trap"}
     ]
+  },
+  "GRAVE_STONE": {
+    "id": "GRAVE_STONE",
+    "name": "Grave Stone",
+    "description": "Something died here. Was this your doing?",
+    "inventory_count": 0,
+    "components": [
+      {"_type": "Tile", "display": "\u21ef",
+        "foreground": [32, 123, 164],
+        "background": [24, 205, 189]
+      },
+      {"_type": "Device",
+        "config": {"test": true},
+        "events": []},
+      {"_type": "Sprite", "name": "grave_stone"}
+    ]
   }
 }