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Key Bum item

Key Bum is an unlockable familiar in The Binding of Isaac, added in the Afterbirth DLC.

Description

Spawns a familiar that follows Isaac and collects keys. It has a 20% chance of dropping a random chest upon collecting a key.

Picking up a Charged Key will make Key Bum spawn a Lil' Battery.

Key Bum cannot pick up Golden Keys.

Note

This page shows the latest information as of the new Repentance+ (Online Co-op) DLC.
To see information about this item for the previous Repentance version, check this page instead.

How to unlock?

Defeat Ultra Greed as Lazarus.

Transformations

This item contributes towards the Super Bum transformation. Collecting 3 items from this set will transform Isaac's bums into Super Bum, a familiar that collects coins, red hearts and keys, and drops twice as many rewards.

Item pools

Key Bum can be found in the following item pools:

Name Weight
Treasure Room
1.0/1.0
Secret Room
1.0/1.0
Key Master
1.0/1.0
Baby Shop
1.0/1.0

Tags

The following tags are applied to this item:

Id Description
summonable Can be summoned via Lemegeton.
offensive Can appear for Tainted Lost.

Special synergies

The following special synergies and interactions for Key Bum have been documented.

Mod Item Synergy
--- BFFS! Increases the chance of dropping chests.

* Note that not all possible synergies and interactions are listed here.

External links




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See all items in The Binding of Isaac