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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 VariantDLC.png

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.png
Black Fly
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Attack Fly
Moters.png
Moter

White fly.png
Eternal Fly
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Pouter.png
Pooter

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Fat Fly
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Boomfly.png
Boom Fly
Spitfly.png
Red Boom Fly
Gaper.png
Gaper

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Frowning
Gaper

Gurgle.png
Gurgle
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Mr. Maw
Mulligan.png
Mulligan
Mulligoon.png
Mulligoon
Mulliboom.png
Mulliboom
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Hive.png
Hive


Pacer.png
Pacer
Gusher.png
Gusher


Hopper.png
Hopper

FHopper.png
Flaming
Hopper


Leaper.png
Leaper
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Vis

Vis Fio.png
Double Vis
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Chubby Vis.png
Chubber
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Sucker.png
Sucker

Puffer.png
Spit
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Black spider.png
Spider
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Big spider.png
Big Spider
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Spider hopper.png
Trite
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Maggot.png
Maggot
Charger.png
Charger
Spity.png
Spitty
Globin.png
Globin

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Gazing
Globin
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Knight

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Selfless
Knight
Horfs.png
Horf
Maws.png
Maw
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Red Maw

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Psychic
Maw

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Boil.png
Boil

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Gut
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White boil.png
Sack
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Clotty.png
Clotty

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Clot


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I. Blob
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Eye.png
Eye

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Bloodshot
Eye
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Host
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Red Host
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Baby
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Angelic Baby
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Keeper.png
Keeper
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Hang man.png
Hanger
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Poky.png
Poky

Slide.png
Slide
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Brain.png
Brain
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Membrain
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Guts
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Mama Guts
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Leech

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Kamikaze
Leech

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Holy
Leech

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Parabite.png
Para-Bite
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Swarmer
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Mask Heart.png
Mask + Heart
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Centipede.png
B. Licker
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Fred.png
Fred
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Lump
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Embryo
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Dople
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Twin Evil
Turret.png
Stone Grimace

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Vomit Grimace
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