ZygZagGaming

Hello, I'm trying to add a custom recipe type (1.16.3) like item repairing. I have a custom item, and I'd like crafting it in specific shapeless recipes increase its durability and change its nbt data. How do I do this?

I have an @SubscribeEvent method that is called whenever the AttackEntityEvent is called. Whenever it is called, the game crashes. Here is the code: @SubscribeEvent public static void onAttack(AttackEntityEvent event) { /* if the entity who attacked was a player and was holding a t3 core then it is set to t4 */ PlayerEntity player = event.getPlayer(); int count = player.getHeldItemMainhand().getCount(); ServerWorld world = (ServerWorld) event.getEntity().world; if (event.getPlayer().getHeldItemMainhand().getMaxDamage() >= 15) { ItemStack stack = ItemRegistryHandler.T4_CORE.get().getDefaultInstance(); stack.setCount(1); player.setItemStackToSlot(EquipmentSlotType.MAINHAND, stack); ItemEntity item = new ItemEntity(EntityType.ITEM, world); stack.setCount(count - 1); item.setItem(stack); world.summonEntity(item); } }