Attack Fly

For other uses, see Fly (disambiguation).

Attack Flies are red-and-black flashing type of fly enemies that will follow Isaac relentlessly until killed. Like regular Black Flies and few other types, they are commonly found in every chapter.

Behavior

Smaller Variant

Their only way of damaging Isaac is by contact, and they move rather slowly, making them easy to kill. However, they can be dangerous when found in groups, as they can swarm around Isaac quickly.

Attack Flies turn into regular Black Flies if Isaac has Skatole. They take a small amount of time to convert into Black Flies, so it is possible for Isaac to be damaged if the player is not careful.

Larger Variant

Attack Fly
Information
Health	???
Related Entities	Black Fly Eternal Fly
Locations
Chapter 1	The Basement The Cellar
Chapter 2	The Caves The Catacombs
Chapter 3	The Depths Necropolis
Chapter 4	The Womb Utero
Chapter 6	The Chest

These have the exact same behavior as regular attack flies, and move at the same speed. However, they're larger and have more health than regular Attack Flies. They don't spawn in normal rooms, rather they are spawned from Eternal Flies, The Duke of Flies, and The Husk.

Large Attack Flies are unaffected by Skatole.

Notes

• Can be spawned constantly by The Duke of Flies, and spawned upon the Mulligan's suicide.
• They have multiple chances to spawn from the Shell Game Beggar from the Arcade.

Monsters
Fly variants	Black Fly • Attack Fly • Moter • (: Eternal Fly)
Gaper variants	Gaper • Frowning Gaper • Mr. Maw • (: Gurgle)
Mulligan variants	Mulligan • Mulligoon • Hive • (: Mulliboom)
Horf variants	Horf • Maw • Red Maw • (: Psychic Maw)
Vis variants	Vis • (: Double Vis • Chubber)
Maggot variants	Maggot • Charger • Spitty
Hopper variants	Hopper • Flaming Hopper • Leaper
Boil variants	Boil • (: Gut • Sack)
Clot variants	Clotty • Clot • I. Blob
Leech variants	Leech • Kamikaze Leech • (: Holy Leech)
Spider variants	: Spider • Big Spider • Trite
Pooter variants	Pooter • (: Fat Fly)
Boomfly variants	Boom Fly • Red Boom Fly
Pacer variants	Pacer • Gusher
Sucker variants	Sucker • (: Spit)
Globin variants	Globin • Gazing Globin
Knight variants	Knight • Selfless Knight
Eye variants	Eye • Bloodshot Eye
Host variants	Host • Red Host
Baby variants	Baby • (: Angelic Baby)
Eye variants	Eye • Bloodshot Eye
Poky variants	Poky • (: Slide)
Brain variants	Brain • Membrain
Gut variants	Guts • (: Mama Guts)
Dople variants	Dople • Evil Twin
Grimace variants	Stone Grimace • (: Vomit Grimace)
Keeper variants	: Keeper • Hanger
Standalone variants	Para-Bite • Fred • Lump • Embryo • Peep Eye • (: Swarmer • Mask + Heart • B. Licker)