diff --git a/src/entity/gateway/entitygateway.rs b/src/entity/gateway/entitygateway.rs
index c6324e1..e9e0130 100644
--- a/src/entity/gateway/entitygateway.rs
+++ b/src/entity/gateway/entitygateway.rs
@@ -60,6 +60,10 @@ pub trait EntityGateway: Send + Sync + Clone {
         unimplemented!();
     }
 
+    async fn feed_mag(&mut self, _mag_item_id: &ItemEntityId, _tool_item_id: &ItemEntityId) {
+        unimplemented!();
+    }
+
     async fn get_items_by_character(&self, _char: &CharacterEntity) -> Vec<ItemEntity> {
         unimplemented!();
     }
diff --git a/src/entity/gateway/inmemory.rs b/src/entity/gateway/inmemory.rs
index 5959a39..54ad825 100644
--- a/src/entity/gateway/inmemory.rs
+++ b/src/entity/gateway/inmemory.rs
@@ -13,6 +13,7 @@ pub struct InMemoryGateway {
     user_settings: Arc<Mutex<BTreeMap<UserSettingsId, UserSettingsEntity>>>,
     characters: Arc<Mutex<BTreeMap<CharacterEntityId, CharacterEntity>>>,
     items: Arc<Mutex<BTreeMap<ItemEntityId, ItemEntity>>>,
+    mag_feedings: Arc<Mutex<BTreeMap<ItemEntityId, Vec<ItemEntityId>>>>,
 }
 
 impl InMemoryGateway {
@@ -22,6 +23,7 @@ impl InMemoryGateway {
             user_settings: Arc::new(Mutex::new(BTreeMap::new())),
             characters: Arc::new(Mutex::new(BTreeMap::new())),
             items: Arc::new(Mutex::new(BTreeMap::new())),
+            mag_feedings: Arc::new(Mutex::new(BTreeMap::new())),
         }
     }
 }
@@ -165,6 +167,13 @@ impl EntityGateway for InMemoryGateway {
             });
     }
 
+    async fn feed_mag(&mut self, mag_item_id: &ItemEntityId, tool_item_id: &ItemEntityId) {
+        self.mag_feedings.lock().unwrap()
+            .entry(*mag_item_id)
+            .or_insert(Vec::new())
+            .push(*tool_item_id);
+    }
+
     async fn get_items_by_character(&self, character: &CharacterEntity) -> Vec<ItemEntity> {
         let items = self.items.lock().unwrap();
         items
@@ -179,6 +188,25 @@ impl EntityGateway for InMemoryGateway {
             .map(|(_, k)| {
                 k.clone()
             })
+            .map(|mut item| {
+                item.item = match item.item {
+                    ItemDetail::Mag(mut mag) => {
+                        self.mag_feedings.lock().unwrap().get(&item.id).map(|mag_feedings| {
+                            for mag_feed_id in mag_feedings.iter() {
+                                items.get(&mag_feed_id).map(|mag_feed| {
+                                    match mag_feed.item {
+                                        ItemDetail::Tool(mag_feed) => mag.feed(mag_feed.tool),
+                                        _ => {}
+                                    }
+                                });
+                            }
+                        });
+                        ItemDetail::Mag(mag)
+                    }
+                    _ => item.item
+                };
+                item
+            })
             .collect()
     }
 }