[
  {
    "name": "GROUP_VAMPBAT_UPGRADE",
    "type": "monstergroup",
    "default": "mon_null",
    "monsters": [
      { "monster": "mon_bigvampbat", "freq": 100, "cost_multiplier": 0 },
      { "monster": "mon_feralvampbat", "freq": 100, "cost_multiplier": 0 }
    ]
  },
  {
    "name": "GROUP_CRYPTIES_UPGRADE",
    "type": "monstergroup",
    "default": "mon_null",
    "monsters": [
      { "monster": "mon_zombie_bloodinfused", "freq": 100, "cost_multiplier": 0 },
      { "monster": "mon_zombie_blooddefused", "freq": 100, "cost_multiplier": 0 }
    ]
  },
  {
    "name": "GROUP_CRYPTIES_DEFUSEDUPGRADE",
    "type": "monstergroup",
    "default": "mon_null",
    "monsters": [ { "monster": "mon_zombie_bonewraith", "freq": 100, "cost_multiplier": 0 } ]
  },
  {
    "name": "GROUP_CRYPTIES_INFUSEDUPGRADE",
    "type": "monstergroup",
    "default": "mon_null",
    "monsters": [ { "monster": "mon_zombie_bonetitan", "freq": 100, "cost_multiplier": 0 } ]
  },
  {
    "name": "GROUP_LEECH_UPGRADE",
    "type": "monstergroup",
    "default": "mon_null",
    "monsters": [
      { "monster": "mon_insect_abominableleech", "freq": 100, "cost_multiplier": 0 },
      { "monster": "mon_insect_vampireleech", "freq": 100, "cost_multiplier": 0 },
      { "monster": "mon_insect_hugeleech", "freq": 100, "cost_multiplier": 0 },
      { "monster": "mon_insect_eyedleech", "freq": 100, "cost_multiplier": 0 }
    ]
  },
  {
    "name": "GROUP_LEECH_EYEDUPGRADE",
    "type": "monstergroup",
    "default": "mon_null",
    "monsters": [
      { "monster": "mon_insect_bloodsurgeleech", "freq": 100, "cost_multiplier": 0 },
      { "monster": "mon_insect_sharpshooterleech", "freq": 100, "cost_multiplier": 0 }
    ]
  },
  {
    "name": "GROUP_LEECH_ABOMIUPGRADE",
    "type": "monstergroup",
    "default": "mon_null",
    "monsters": [
      { "monster": "mon_insect_bloatedleech", "freq": 100, "cost_multiplier": 0 },
      { "monster": "mon_insect_venomleech", "freq": 100, "cost_multiplier": 0 }
    ]
  },
  {
    "name": "GROUP_LEECH_HUGEUPGRADE",
    "type": "monstergroup",
    "default": "mon_null",
    "monsters": [
      { "monster": "mon_insect_spikyleech", "freq": 100, "cost_multiplier": 0 },
      { "monster": "mon_insect_acidicleech", "freq": 100, "cost_multiplier": 0 }
    ]
  },
  {
    "name": "GROUP_LEECH_VAMPUPGRADE",
    "type": "monstergroup",
    "default": "mon_null",
    "monsters": [ { "monster": "mon_insect_dreadfulleech", "freq": 100, "cost_multiplier": 0 } ]
  }
]