[
  {
    "type": "monstergroup",
    "id": "GROUP_DESERT",
    "default": "mon_null",
    "is_animal": true,
    "monsters": [
      {
        "monster": "mon_bat",
        "weight": 50,
        "cost_multiplier": 2,
        "pack_size": [ 3, 12 ],
        "conditions": [ "DAWN", "DUSK", "SPRING", "SUMMER", "AUTUMN" ]
      }
    ]
  }
]
