Key Bum

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Key   Bum
Removed in Afterbirth †Item icon
Added in Afterbirth †Item icon
Item altar
"He wants your keys!"
Table dividing line 1.png
Item ID
5.100.388
Table dividing line 2.png
Table dividing line 3.png
Collection Grid
Added in Afterbirth † / Removed in Repentance(page 4, column 3, row 2)
Removed in Afterbirth †(page 4, column 3, row 2)
Added in Repentance(page 4, column 4, row 2)
Unlock Method
Key Bum Defeat Ultra Greed as Lazarus
Added in Afterbirth

Key Bum is an unlockable passive item added in Afterbirth.

Effects[edit | edit source]

  • Spawns a familiar that follows Isaac around and collects keys, dropping random Chests in return. (He does not fill up a familiar "slot".)
  • This item belongs to the Super Bum set. Collecting three items from this set will transform Isaac's bums into Super Bum.

Notes[edit | edit source]

Synergies[edit | edit source]

  • 15►BFFS! BFFS!: Familiar is bigger and drops chests more often.

In-game Footage[edit | edit source]

Seeds[edit | edit source]

PC WJK1 9R0Z (Treasure Room adjacent to spawn)

Bugs[edit | edit source]

Bug Bug! If Credit Card is used in a Shop with keys, Key Bum will not be able to pick up the free keys. This can be fixed if Isaac leaves and re-enters the shop.
Bug Bug! Removed in Repentance Charged Keys do not increment Key Bum's key count when picked up.


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