{
  "type": "minecraft:jigsaw",
  "biomes": "#minecraft:has_structure/bastion_remnant",
  "max_distance_from_center": 128,
  "spawn_overrides": {
    "monster": {
      "bounding_box": "piece",
      "spawns": []
    }
  },
  "step": "underground_decoration",
  "start_height": {
    "absolute": 32
  },
  "start_pool": "nova_structures:donjon/donjon_framework/donjon_center_start",
  "size": 20,
  "use_expansion_hack": false
}