Mutant Fly

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Mutant Fly
Mutant Fly.png
Spawns In: Mutant Bug Lair, Skull Cavern
Floors: N/A
Killable: Yes
Base HP: 66
Base Damage: 12
Base Def: 1
Speed: 2
XP: 10
Variations: Cave Fly.png Cave FlyCave Fly Dangerous.png Cave Fly (dangerous)
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 and on Prehistoric Floors in the Skull Cavern. Mutant Flies count towards the 80 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 towards the player (including through walls) at high speeds and deal damage on contact. They will then loop around for another pass.


Stand still and swing with a sword that has high knockback right before the fly makes contact.


  • 1.1: Introduced.
  • 1.6: Changed Monster Eradication Goal for cave insects from 125 to 80.