[
  {
    "id": "GROUP_MYTHOS_SPAWN",
    "type": "monstergroup",
    "monsters": [
      { "monster": "mon_rat_thing_dm" },
      { "monster": "mon_ghoul_dm" },
      { "monster": "mon_ghast_dm" },
      { "monster": "mon_nightgaunt_dm" },
      { "monster": "mon_deep_one_dm" }
    ]
  }
]
