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Transformations alter Isaac's appearance and grant him special abilities.

A transformation occurs when obtaining at least three different items from a particular set of items.
These collectibles always share a particular theme that corresponds with the transformation.

Transformation Sets[edit | edit source]

Name Appearance Description Items
Beelzebub Beelzebub

Grants flight and converts small enemy flies into Blue Flies.

Guppy Guppy

Grants flight and spawns a Blue Fly each time a tear hits an enemy.

Added in Afterbirth Bob Bob

Isaac gains a green trail of poisonous creep.

Added in Afterbirth Conjoined Conjoined

When attacking, the tumor faces shoot tears diagonally outwards, similar to the effect of Added in AfterbirthThe Wiz The Wiz. Also gives -0.3 damage and slightly decreases tears.

Added in Afterbirth Fun Guy Fun Guy

+1 Red Heart container.

Added in Afterbirth Leviathan Leviathan

Grants flight and gives +2 black hearts.

Added in Afterbirth Oh Crap Oh Crap

Whenever a pile of poop is destroyed, health is replenished by half a heart.

Added in Afterbirth Seraphim Seraphim

Grants flight and gives +3 soul hearts.

Added in Afterbirth Spun Spun

Gives +2 damage and +0.15 speed, and spawns a random pill upon transformation.

Added in Afterbirth Super Bum Super Bum

Replaces Bum Friend Bum Friend, Dark Bum Dark Bum, and Added in AfterbirthKey Bum Key Bum for Super Bum. This bum collects any of the other beggars' pickups, and offers twice the rewards.

Added in Afterbirth Yes Mother? Yes Mother?

Isaac gains a stationary knife that trails directly behind him. It synergizes like Mom's Knife Mom's Knife would.

Added in Afterbirth † Adult Adult

Grants a heart container.

Added in Afterbirth † Bookworm Bookworm

Roughly 50% of the time, Isaac shoots an extra tear, like 20/20 20/20.

Added in Afterbirth † Spider Baby Spider Baby

Spawns a spider familiar that applies random status effects to enemies it comes in contact with.

Added in Afterbirth † Stompy None

Taking damage has a chance to spawn rock waves.

Requirements[edit | edit source]

  • Items only need to have been acquired once in order to count. Keeping them is not required.
    • Duplicate items (like those acquired from Added in AfterbirthDiplopia Diplopia) do not count toward transformations when picked up. Only the first instance of an item Isaac owns will count.
    • Activated collectibles (e.g. Guppy's Head Guppy's Head) can be picked up once and then swapped away with another without any loss to transformation progress.
    • Rerolling items with a dice room, the D4 D4, or the D100 D100 will not remove progress towards the transformation.
    • Added in Afterbirth Familiars gained from Added in AfterbirthCambion Conception Cambion Conception or Added in AfterbirthImmaculate Conception Immaculate Conception do not count towards transformation progress.
  • Trinkets do not count toward progress for any transformation.
  • Pills only count toward Adult and Stompy, they do not count toward progress for any other transformation.

Notes[edit | edit source]

  • Transformations can be combined, keeping the effects of all transformations with no effects overriding others.
  • Transforming into Beelzebub for the first time will unlock the Lord of the Flies achievement and Added in Afterbirth †Angry Fly Angry Fly.
  • Since none of the Afterbirth transformations unlock an achievement or item, attaining them is not required for 100% completion of the game in terms of achievements. Added in Afterbirth However, this is only true if you unlocked Mom's Contacts Mom's Contacts on Rebirth, as the Yes Mother? transformation will happen once you collect three Mom items on Afterbirth and Afterbirth †.
  • Many of the Afterbirth transformations override the charge animations of items such as Monstro's Lung Monstro's Lung and Brimstone Brimstone, potentially making them more difficult to use.
    • Added in Afterbirth † There is now an option to show a charge bar that floats above Isaac.

Gallery[edit | edit source]

Trivia[edit | edit source]

  • There are two transformations in the base game, nine more in the Afterbirth DLC, and four more in the Afterbirth † DLC.
  • In the original The Binding of Isaac flash game, the transformation into Guppy was the only one available, making it chronologically the first.
    • The Eternal Edition of the original The Binding of Isaac game added another transformation that turned Isaac into an angel after gaining 7 heart containers from eternal hearts.
  • Rebirth introduced Beelzebub as the chronologically second transformation.
  • The original name for the Beelzebub transformation was Lord of the Flies.

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