{
  "type": "minecraft:jigsaw",
  "biomes": "minecraft:lush_caves",
  "start_pool": "cataclysm:amethyst_nest/start_pool",
  "use_expansion_hack": true,
  "step": "underground_decoration",
  "size": 2,
  "start_height": {
    "type": "minecraft:uniform",
    "min_inclusive": {
      "absolute": -10
    },
    "max_inclusive": {
      "absolute": 10
    }
  },
  "max_distance_from_center": 80,
  "spawn_overrides": {
    "monster": {
      "bounding_box": "piece",
      "spawns": [
        {
          "type": "cataclysm:amethyst_crab",
          "maxCount": 1,
          "minCount": 1,
          "weight": 1
        }
      ]
    }
  }
}