Boom Fly
Boom Flies fly across the room 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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