The Binding of Isaac Wiki
Register
Advertisement

Boom Flies are large flies with small wings and large, beady eyes. They are mainly found in The Caves and The Depths.

Behavior

Boom Flies are much larger than normal Flies. Rather than trying to follow you, they will instead fly around the room diagonally, bouncing off walls. They have considerable health, taking at least six initial tears to go down. They explode upon death, typically killing all other monsters and dealing a full heart of damage in a small radius.

With a correct timing, they can be used to destroy Rocks or open up Secret Rooms.

When fighting a Boom Fly, it is advised to keep your distance from it and maintain considerable range; if you stay too close to it when you kill it, it will explode and deal damage to Isaac. Due to this, fighting a Boom Fly when the player has very low range is quite risky.

Champion VariantWrath of the Lamb DLC

Eternal Bomb Flies cause a gigantic explosion upon death, significantly larger than a Mr. Mega bomb.

This variant was added in the Eternal Edition update but exclusively encountered in Hard Mode.

Notes

  • The Skatole item slows down Boom Flies and Red Boom Flies drastically, but they will still explode on death and can damage Isaac.

Bugs

  • If you collected Bob's Curse and kill a boom fly after (at any given time), the Boom Fly's explosion will be green, and its the same for all the Boom Flies you encounter after picking up Bob's Curse. Does not apply for Red Boom Flies.
Monsters
Fly variants FlyBlack FlyCUSTOMredflyAttack FlyMotersMoter • (Wrath of the Lamb DLC: White flyEternal Fly)
Gaper variants GaperGaperFrowninggaperFrowning GaperShape4336Mr. Maw • (Wrath of the Lamb DLC: Green gaperGurgle)
Mulligan variants MulliganMulliganMulligoonMulligoonHiveHive • (Wrath of the Lamb DLC: MulliboomMulliboom)
Horf variants HorfsHorfMawsMawRedmawRed Maw • (Wrath of the Lamb DLC: PsychicmawPsychic Maw)
Vis variants VisVis • (Wrath of the Lamb DLC: Vis FioDouble VisChubby VisChubber)
Maggot variants MaggotMaggotChargerChargerSpitySpitty
Hopper variants HopperHopperFHopperFlaming HopperLeaperLeaper
Boil variants BoilBoil • (Wrath of the Lamb DLC: Green boilGutWhite boilSack)
Clot variants ClottyClottyClot2ClotBlockadeI. Blob
Leech variants LeechLeechLeech2Kamikaze Leech • (Wrath of the Lamb DLC: Holy leechHoly Leech)
Spider variants Wrath of the Lamb DLC: Black spiderSpiderBig spiderBig SpiderSpider hopperTrite
Pooter variants PouterPooter • (Wrath of the Lamb DLC: SuperpooterFat Fly)
Boomfly variants BoomflyBoom FlySpitflyRed Boom Fly
Pacer variants PacerPacerGusherGusher
Sucker variants SuckerSucker • (Wrath of the Lamb DLC: PufferSpit)
Globin variants GlobinGlobinGlobin 2Gazing Globin
Knight variants KnightsKnightAlternative knightSelfless Knight
Eye variants EyeEyeEye2Bloodshot Eye
Host variants Host1HostHost2Red Host
Baby variants BobyBaby • (Wrath of the Lamb DLC: Angel babyAngelic Baby)
Eye variants EyeEyeEye2Bloodshot Eye
Poky variants PokiesPoky • (Wrath of the Lamb DLC: Spike trapSlide)
Brain variants BrainBrainMembrainMembrain
Gut variants GutsMonsterGuts • (Wrath of the Lamb DLC: Big gutsMama Guts)
Dople variants Dople1DopleDople 2Evil Twin
Grimace variants TurretStone Grimace • (Wrath of the Lamb DLC: VomitTurretVomit Grimace)
Keeper variants Wrath of the Lamb DLC: AvariceKeeperHang manHanger
Standalone variants ParabitePara-BiteFredFredLumpLumpEmbryoEmbryoPeep Eye • (Wrath of the Lamb DLC: SwarmheadSwarmerMask HeartMask + HeartCentipedeB. Licker)
Advertisement