rewards:
      waves:
        every:
          '3': coal:4
          '5': wood:5, stone:10
          '15': gold_ingot:3
        after:
          '20': iron_sword, iron_pickaxe, iron_spade
          '40': diamond:15
          '60': diamond_sword, diamond_pickaxe, diamond_spade, diamond_hoe, diamond_axe