Mutant Fly

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Mutant Fly
Mutant Fly.png
Spawns In: Mutant Bug Lair
Floors: N/A
Killable: Yes
Base HP: 66
Base Damage: 12
Base Def: 1
Speed: 2
XP: 10
Variations: Cave Fly
Drops: Ancient Seed.png Ancient Seed (0.5%)Bug Meat.png Bug Meat (90%)Dwarf Scroll I.png Dwarf Scroll I (0.5%)Dwarf Scroll IV.png Dwarf Scroll IV (0.1%)White Algae.png White Algae (2%)

If reached bottom of Mines:

Diamond.png Diamond (0.05%)Prismatic Shard.png Prismatic Shard (0.05%)

Mutant Flies are an enemy found in the Mutant Bug Lair. Mutant Flies count towards the 125 Cave Insects killed for Monster Eradication Goals.

They can hatch from Mutant Grubs if the player gets close and allows it to enter its cocoon phase. Mutant Grubs hatch shortly after entering their cocoon into Mutant Flies.


They will fly at you (including through walls) at high speeds and damage you on contact. They will then loop around for another pass.


Stand still and swing at them with a sword with high knockback right before it hits you.


  • 1.1: Introduced.