Beelzebub (Transformation)

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Guppy Beelzebub Added in  Afterbirth Super Bum Added in  Afterbirth Yes Mother? Added in  Afterbirth Bob Added in  Afterbirth Fun Guy Added in  Afterbirth Leviathan Added in  Afterbirth Conjoined
Added in  Afterbirth Spun Added in  Afterbirth Seraphim Added in  Afterbirth Oh Crap Added in Afterbirth † Bookworm Added in Afterbirth † Spider Baby Added in Afterbirth † Adult Added in Afterbirth † Stompy

Isaac turns into a giant humanoid fly and gains flight. While in this form, most types of enemy flies will automatically be converted into blue flies. This process unlocks the Achievement Lord of the Flies.

Requires any combination of three of the following items to be collected:

Active Collectibles[edit | edit source]

Name ID Icon Quote Description
Added in  Afterbirth Jar of Flies 434
Jar of Flies
Gotta catch 'em all? Every time Isaac kills an enemy, a fly will be added to the jar, up to a maximum of 20. Using the Jar of Flies will release all the flies that are currently in the jar as friendly blue flies that will damage enemies.

Passive Collectibles[edit | edit source]

Name ID Icon Quote Description
???'s Only Friend 320 ???'s Only Friend Controlled friend Summons a big attack fly that can be controlled with the shooting direction-keys.
Added in Afterbirth † Angry Fly 511 Angry Fly He's violent Spawns a fly familiar that orbits around a random enemy and deals 5 damage per tick to enemies it comes in contact with.
BBF 272 BBF Big Beautiful Fly Spawns a familiar that flies around the room in a manner similar to the Boom Fly and explodes on contact with an enemy. Respawns after ten seconds.
Best Bud 274 Best Bud Sworn protector When hit, summons a white attack fly similar to Distant Admiration for the current room.
Big Fan 279 Big Fan Fat protector Spawns a large orbital familiar that blocks enemy projectiles and deals slight contact damage to enemies.
Distant Admiration 57 Distant Admiration Attack fly A red attack fly circles further out than the Halo of Flies / Pretty Flies, but closer than Forever Alone. Deals more damage than Forever Alone.
Forever Alone 128 Forever Alone Attack fly Spawns a blue attack fly that orbits a long distance from Isaac.
Added in  Afterbirth Friend Zone 364 Friend Zone Friendly fly A white orbiting fly which deals 3 contact damage per tick to enemies. This familiar orbits Isaac at a middle length distance somewhere between Distant Admiration and Forever Alone.
Halo of Flies 10 Halo of Flies Projectile protection Spawns two pretty fly familiars that block enemy shots and deal contact damage to enemies.
Hive Mind 248 Hive Mind Giant spiders and flies Increases the size of blue spiders and blue flies and doubles the amount of damage they deal.
Infestation 148 Infestation They grow inside 1-3 blue flies randomly spawn every time Isaac gets hit.
Added in  Afterbirth Lost Fly 365 Lost Fly Lost protector A familiar fly that moves in a straight line and attaches itself to the first obstacle or wall it comes into contact with in each room. If any enemies walk into its path, it will deal 7 contact damage per tick. If the obstacle it is attached to is destroyed then it will continue rolling in the direction it was previously travelling until it meets another wall or obstacle.
The Mulligan 151 The Mulligan They grow inside Tears have a 1/6 chance of spawning allied blue flies when they hit an enemy.
Added in  Afterbirth Obsessed Fan 426 Obsessed Fan Follows my every move... A purple fly familiar that follows Isaac's movements on a 3 second delay and deals contact damage to enemies.
Added in  Afterbirth Papa Fly 430 Papa Fly Turret follower A blue fly familiar follows Isaac's movements on a 3 second delay. Papa Fly will fire tears at nearby enemies.
Skatole 9 Skatole Fly love All types of fly except Boom Fly and Red Boom Fly become passive and slowly move towards Isaac. Does not prevent contact damage.
Smart Fly 264 Smart Fly Revenge fly After Isaac takes damage, this fly will deal continuous touch damage to whatever enemy caused the damage until it is dead. The fly will then systematically attack 1 enemy at a time until the room is cleared.

Notes[edit | edit source]

  • The player starts with this transformation in the Solar System challenge.

Unlockable Achievements[edit | edit source]

Trivia[edit | edit source]

  • Beelzebub is the name of a Demonic fly who is known as "Lord of the flies" and is known as one of the 7 princes of hell. Beelzebub is also another name for the devil.
  • In modern Catholic tradition, Beelzebub is regarded as one of the 7 princes of Hell; however, the origins of the name Beelzebub actually date back to an early Jewish insult for worshippers of a Canaanite Deity Baal, calling him Baal, 'Lord of all that flies'.

Seeds[edit | edit source]

 PC  W2DW TA79 (Allows Isaac to become Beelzebub in Caves XL. First two treasure rooms are Big Fan and Attack Fly, one of the treasure rooms in Caves XL is Halo of Flies)

 PC  9CM4 JDBL (Last fly item collected on Flooded Caves I)

 PC  B14A Q44Y (also contains four Guppy items)


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