Dark Bum
ItemRebirthUnlocked
familiarGame ID 278★★★★
How do you unlock Dark Bum?
Verified starting unlockSource data confirms that no unlock is required.
Spawns a familiar that follows Isaac around and collects Red Hearts. For every 1½ Red Hearts collected, Dark Bum will give a reward.
Available from the start
No unlock needed — this is available in every new save file.
What unlocking Dark Bum leads to
Nothing depends on this yet.
Source: bindingofisaacrebirth.wiki.gg
Imported 2026-09-13