Binding of Isaac: Rebirth Wiki
Binding of Isaac: Rebirth Wiki

Dark Bum is a passive item.


Added in Repentance Loot Table
Pickup Chance
Black Heart 40%
Card or Rune 20%
Pill 20%
Blue Spider 10%
Spider 10%
  • Added in Afterbirth This item belongs to the Super Bum set. Collecting three items from this set will transform Isaac's bums into Super Bum.


  • If Dark Bum enters a Super Secret Room that mimics Womb Womb, Cathedral Cathedral, or Removed in Afterbirth Dark Room Dark Room / Added in Afterbirth Library, he will drop Red Hearts, Eternal Hearts, or Black Hearts respectively instead of Soul Hearts.
    • If the Super Secret Room mimics The Womb, he will drop Red Hearts instead of Soul Hearts, then gobble them back up. This can be avoided by allowing Dark Bum to pick up all of the Red Hearts and then quickly exiting the super secret room before he starts dropping hearts. This way, he will drop Soul Hearts.
  • Dark Bum will not pick up Added in AfterbirthGold Hearts, Added in Afterbirth † Blended Hearts, Added in Afterbirth † Bone Hearts, or Added in RepentanceRotten Hearts.
  • Very beneficial for ??? ???, since he has no use for Red Hearts.
  • Scared Hearts will run away from Dark Bum. Try to pinch them between Dark Bum and Isaac so he can collect them.
  • Added in RepentanceDark Bum will not appear if playing as Tainted Lost Tainted Lost.


  • 15►Little C.H.A.D. Little C.H.A.D.: Each Half Red Heart dropped by Little C.H.A.D. can be collected by Dark Bum, increasing the amount of pickups dropped.
  • 15►Gimpy Gimpy: Enemy kills have the chance to drop Half Red Hearts that can be collected by Dark Bum, which when combined with Gimpy's chance to drop Soul Hearts when Isaac is damaged is a good way to generate Soul and Black Hearts as well as other pickups.
  • Added in Afterbirth15►Key Bum Key Bum: Dark Bum's dropped card will always be Ace of Spades.
  • 15►Humbling Bundle Humbling Bundle: Most red heart drops will become double red heart drops. This counts as two full red hearts for Dark Bum, essentially doubling the value of it. The black hearts dropped from Dark Bum can be doubled as well.


  • 15►BFFS! BFFS!: No effect, but familiar is bigger.

In-game Footage[]


  • Back when Rebirth was released, and well after, Dark Bum was (and may still be) considered by many as one of the best defensive/healing items in the game. The sheer amount of red hearts converted into soul hearts far surpassed the need of having red heart containers. As the bum got nerfed over time, so has its popularity dropped, too.


  • v1.02: Dark Bum's Red to Soul Heart conversion rate was set to 1.5:1.
  • v1.031: Dark Bum was changed to have a chance to spawn friendly Blue Spiders or hostile Spiders.
  • v1.06.J796: Dark Bum can no longer be found by Tainted Lost.


PC WBEG Q22R (Treasure Room adjacent to spawn)

PC CS9M XL2P (Treasure Room adjacent to spawn)

PC AL07 13JY (Treasure Room adjacent to spawn)

PS4 7276 4P61 (Treasure Room adjacent to spawn)

Vita EVQ8 P80Q (Treasure Room adjacent to spawn)

Switch Hard mode only VYNW SA7F (Treasure Room left from spawn)

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