Mutant Fly

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Mutant Fly
Mutant Fly.png
Spawns In: Mutant Bug Lair
Killable: Yes
Base HP: 66
Base Damage: 12
Base Def: 1
Speed: 2
EXP Given: 10
Variations: Cave Fly
Drops: Bug Meat (90%) White Algae (2%) Ancient Seed (0.5%)

If reached bottom of Mines:

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 it's cocoon phase. Mutant Grubs shortly hatch after entering their cocoon into Mutant Flies.


They will fly at you (including through walls) at high speeds and damage the player 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.