[
  {
    "type": "monstergroup",
    "name": "GROUP_ZOMBIE_DOG_UPGRADE",
    "default": "mon_dog_skeleton",
    "//": "No bionics or fungal",
    "monsters": [
      { "monster": "mon_dog_skeleton", "freq": 330, "cost_multiplier": 5 },
      { "monster": "mon_dog_zombie_brute", "freq": 330, "cost_multiplier": 2 },
      { "monster": "mon_zombie_dog_acidic", "freq": 330, "cost_multiplier": 2 }
    ]
  },
  {
    "type": "monstergroup",
    "name": "GROUP_ZOLF_UPGRADE",
    "default": "mon_wolf_skeleton",
    "//": "No bionics or fungal",
    "monsters": [
      { "monster": "mon_wolf_skeleton", "freq": 500, "cost_multiplier": 5 },
      { "monster": "mon_dog_zombie_brute", "freq": 500, "cost_multiplier": 2 }
    ]
  },
  {
    "type": "monstergroup",
    "name": "GROUP_ZOMBEAR_UPGRADE",
    "default": "mon_zombear_skeleton",
    "//": "No bionics or fungal",
    "monsters": [
      { "monster": "mon_zombear_skeleton", "freq": 500, "cost_multiplier": 5 },
      { "monster": "mon_zombear_acidic", "freq": 500, "cost_multiplier": 2 }
    ]
  },
  {
    "type": "monstergroup",
    "name": "GROUP_ZOOSE_UPGRADE",
    "default": "mon_zoose_brute",
    "monsters": [
      { "monster": "mon_zoose_brute", "freq": 500, "cost_multiplier": 15 },
      { "monster": "mon_zoose_thorny", "freq": 500, "cost_multiplier": 5 }
    ]
  },
  {
    "type": "monstergroup",
    "name": "GROUP_ZOUGAR_UPGRADE",
    "default": "mon_zougar_hunter",
    "monsters": [
      { "monster": "mon_zougar_hunter", "freq": 600, "cost_multiplier": 4 },
      { "monster": "mon_zougar_shady", "freq": 400, "cost_multiplier": 6 }
    ]
  }
]
