You need to kill 200 of them for Gil's Monster Eradication Goals located at the Adventurer's Guild. At a certain level in the mines mist appears and multiple bats attack you in waves. This happens more often on days of bad luck.
|Bat||Bats can be found in The Mines at levels 1-39. They have 24 hp and 6 attack.|
|Frost Bat||Frost Bats can be found in The Mines at levels 40-79. They have 36 hp and 7 attack.|
|Lava Bat||Lava Bats can be found in The Mines at levels 80-119. They have 80 hp and 15 attack.|
Frost BatThe Mines, level 40-79 Bat Wing (90%) Bat Wing (55%) Bomb (2%) Dwarf Scroll II (0.5%) Dwarf Scroll IV (0.1%) Rare Disc (0.1%)Lava BatThe Mines, level 80-119, randomly in the Skull Cavern Bat Wing (90%) Bat Wing (70%) Bomb (20%) Dwarf Scroll III (0.5%) Dwarf Scroll IV (0.1%) Rare Disc (0.1%)
Iridium BatSkull Cavern level 50+ Battery Pack (5%) Energy Tonic (5%) Iridium Bar (0.8%) Iridium Ore (90%) Iridium Ore (50%) Iridium Ore (25%) Iridium Ore (10%) Life Elixir (5%) Mega Bomb (5%) Solar Essence (50%)