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Boom Flies fly across the room diagonally in straight diagonal lines, dealing contact damage. Explodes upon death.

Notes[ | ]

  • (in Repentance) While Collectible Skatole iconSkatole is held, the Boom Fly and all of its variants will fly significantly slower and will not deal contact damage, but their other means of attacking/dealing damage will still damage Isaac as normal.
  • While Isaac has the Beelzebub transformation, all Boom Fly variants will become friendly, and will not damage Isaac by any means (including explosions).

Variants[ | ]

Red Boom Fly[ | ]

Red Boom Flies fly across the room in straight diagonal lines, dealing contact damage and releasing 6 blood shots in all directions upon death.

Drowned Boom Fly[ | ]

(except in Rebirth)

Drowned Boom Flies fly across the room in straight diagonal lines, dealing contact damage. Upon death, they explode and release 4 blood shots in the cardinal directions, and sometimes also spawns a Drowned ChargerDrowned Charger. If a Drowned Boom Fly dies while over an obstacle or pit, the Drowned Charger will not be spawned.

Dragon Fly[ | ]

(in Repentance)

Dragon Flies fly across the room in straight diagonal lines, dealing contact damage. Upon death, creates four lines of fire in the cardinal directions; the fire nearly spans the length of an entire normal-sized room.

Dragon Fly X[ | ]

(in Repentance)

Dragon Fly X is identical to the Dragon Fly in behavior, but upon death, creates four lines of fire in the ordinal directions; the fire nearly spans the length of an entire normal-sized room.

Bone Fly[ | ]

(in Repentance)

Bone Flies fly across the room in straight diagonal lines, dealing contact damage and firing bones at Isaac if he lines up with one in a cardinal direction. Upon death, they shoot 3 evenly spaced bones (one of them aligned towards the closest cardinal direction to Isaac).

Sick Boom Fly[ | ]

(in Repentance)

Sick Boom Flies fly across the room in straight diagonal lines, dealing contact damage and trailing poisonous gas. Upon death, they explode into eight clouds of gas and release 6 green shots in all directions. The poison gas left behind upon death persists for much longer, but will dissipate when the room is cleared.

Tainted Boom Fly[ | ]

(in Repentance)

Tainted Boom Flies fly across the room in straight diagonal lines, dealing contact damage. Upon death, they will emit a cross-shaped glow for a brief period, after which they will explode. This explosion sends 4 lines of further explosions in the cardinal directions, which span the length of the room.

They are exclusive to the Ascent to HomeHome.

Gallery[ | ]

Trivia[ | ]

  • (in Repentance) The Boom Fly is tied with the SuckerSucker for being the monster with the most true variants ('true variants' being monsters with ID x.1, x.2, etc), both with 7.
  • (in Repentance) Both Dragonfly types and the Sick Boom Fly first appeared in the Antibirth mod. In Antibirth, instead of having any stage hp they had 20 base hp.
    • Sick Boomflies would only create poison gas on death and would not shoot out six tears when dying.


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