diff --git a/core/src/mindustry/mod/ContentParser.java b/core/src/mindustry/mod/ContentParser.java
index 8e9f759ffb..05198c401e 100644
--- a/core/src/mindustry/mod/ContentParser.java
+++ b/core/src/mindustry/mod/ContentParser.java
@@ -467,6 +467,7 @@ public class ContentParser{
                             case "itemFlammable" -> block.consume((Consume)parser.readValue(ConsumeItemFlammable.class, child));
                             case "itemRadioactive" -> block.consume((Consume)parser.readValue(ConsumeItemRadioactive.class, child));
                             case "itemExplosive" -> block.consume((Consume)parser.readValue(ConsumeItemExplosive.class, child));
+                            case "itemList" -> block.consume((Consume)parser.readValue(ConsumeItemList.class, child));
                             case "itemExplode" -> block.consume((Consume)parser.readValue(ConsumeItemExplode.class, child));
                             case "items" -> block.consume(child.isArray() ?
                                     new ConsumeItems(parser.readValue(ItemStack[].class, child)) :
@@ -1061,17 +1062,25 @@ public class ContentParser{
             }
             Field field = metadata.field;
             try{
-                boolean mergeMap = ObjectMap.class.isAssignableFrom(field.getType()) && child.has("add") && child.get("add").isBoolean() && child.getBoolean("add", false);
+                boolean isMap = ObjectMap.class.isAssignableFrom(field.getType()) || ObjectIntMap.class.isAssignableFrom(field.getType()) || ObjectFloatMap.class.isAssignableFrom(field.getType());
+                boolean mergeMap = isMap && child.has("add") && child.get("add").isBoolean() && child.getBoolean("add", false);
 
                 if(mergeMap){
                     child.remove("add");
                 }
 
                 Object readField = parser.readValue(field.getType(), metadata.elementType, child, metadata.keyType);
+                Object fieldObj = field.get(object);
 
                 //if a map has add: true, add its contents to the map instead
-                if(mergeMap && field.get(object) instanceof ObjectMap<?,?> baseMap){
-                    baseMap.putAll((ObjectMap)readField);
+                if(mergeMap && (fieldObj instanceof ObjectMap<?,?> || fieldObj instanceof ObjectIntMap<?> || fieldObj instanceof ObjectFloatMap<?>)){
+                    if(field.get(object) instanceof ObjectMap<?,?> baseMap){
+                        baseMap.putAll((ObjectMap)readField);
+                    }else if(field.get(object) instanceof ObjectIntMap<?> baseMap){
+                        baseMap.putAll((ObjectIntMap)readField);
+                    }else if(field.get(object) instanceof ObjectFloatMap<?> baseMap){
+                        baseMap.putAll((ObjectFloatMap)readField);
+                    }
                 }else{
                     field.set(object, readField);
                 }
diff --git a/core/src/mindustry/world/consumers/ConsumeItemList.java b/core/src/mindustry/world/consumers/ConsumeItemList.java
new file mode 100644
index 0000000000..7dea4e7a3e
--- /dev/null
+++ b/core/src/mindustry/world/consumers/ConsumeItemList.java
@@ -0,0 +1,33 @@
+package mindustry.world.consumers;
+
+import arc.struct.*;
+import mindustry.gen.*;
+import mindustry.type.*;
+
+public class ConsumeItemList extends ConsumeItemFilter{
+    public ObjectFloatMap<Item> itemMultipliers = new ObjectFloatMap<>();
+
+    public ConsumeItemList(Item... items){
+        this();
+        for(Item i : items){
+            itemMultipliers.put(i, 1f);
+        }
+    }
+
+    public ConsumeItemList(){
+        filter = item -> itemMultipliers.containsKey(item);
+    }
+
+    /** Initializes item efficiency multiplier map. Format: [item1, mult1, item2, mult2...] */
+    public void setMultipliers(Object... objects){
+        for(int i = 0; i < objects.length; i += 2){
+            itemMultipliers.put((Item)objects[i], (Float)objects[i + 1]);
+        }
+    }
+
+    @Override
+    public float efficiencyMultiplier(Building build){
+        var item = getConsumed(build);
+        return itemMultipliers.get(item, 1f);
+    }
+}