Boom Flies fly across the room diagonally in straight diagonal lines, dealing contact damage. Explodes upon death.
Notes[ | ]
While Skatole 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[ | ]
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 Charger. If a Drowned Boom Fly dies while over an obstacle or pit, the Drowned Charger will not be spawned.
Dragon Fly[ | ]
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[ | ]
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[ | ]
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[ | ]
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[ | ]
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 
Home.
Gallery[ | ]
Trivia[ | ]
- The Boom Fly is tied with the Sucker for being the monster with the most true variants ('true variants' being monsters with ID x.1, x.2, etc), both with 7.
- 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.
 The Binding of Isaac: Rebirth
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