Ultra Bum is a transformation in Potato Packs, a mod for The Binding of Isaac. It is part of the Potato Pack 4 submod.
Obtained by holding Dead Bum, Robo Bum, and Holy Bum at the same time.
Combines all 3 aforementioned familiars into Ultra Bum, who automatically collects all Soul Hearts, batteries, and Red Hearts off the ground and drops twice as many rewards as the regular bums would have.
Part of the Potato Pack 4 mod.