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Dark Bum is a passive item.

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Item icon
Item altar

Item Pool Treasure Room.png Treasure Room
Item Pool Devil Room.png Devil Room
Added in Afterbirth (page 3, column 13, line 2)
Removed in Afterbirth (page 3, column 3, line 8)


  • Spawns a familiar that follows Isaac around and collects red hearts. For every one-and-a-half red hearts collected, Dark Bum will generate one of the following:
  •   This item belongs to the Super Bum set. Collecting all three items in this set will grant a Super Bum familiar.


  • If Dark Bum enters a Super Secret Room that mimics The Womb, The Cathedral, or The Dark Room, 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 a considerable amount of soul hearts.


  •   BFFS!
     Increases the size and damage of familiars.
    : Familiar is bigger and increased chance of dropping pickups.
  •     Extension Cord
     Beams of yellow electricity flow between Isaac and his familiars, damaging any enemies between them.
    : Familiar will occasionally be connected to Isaac via electricity.
  •   Little C.H.A.D.
     A familiar who will drop a half red heart every 2 rooms.
    - Convert hearts dropped by Little C.H.A.D. into soul hearts.
  •   Gimpy
     Has a chance of spawning a soul heart or black heart when taking damage. Enemies have a chance to drop a Half Red Heart after being killed.
    - When enemies die and drop red hearts, they get converted into soul hearts.
  •   Humbling Bundle
     Gives one extra pickup (1+1 Free version) of Red Hearts, pennies, bombs, and keys. Does not work with blue, black, and half red hearts, nickels, and dimes.
    - All red hearts dropped are double hearts, so the conversion ratio is greatly improved.
  •   Child's Heart
     Increases the chance of a Heart dropping after clearing a room, and the chance of finding a Heart when opening a Chest.
    - Increases red heart drops and thus increases usage of Dark Bum.
  • ??? - Greatly improves chances of survival, due to Dark Bum converting useless red hearts into useful soul hearts.


  •     Duct Tape
     Stops Isaac's familiars from moving.
    : Familiar will stay in place relative to Isaac.
  •   Keeper - Does nothing, since there's no heart pickups in Keeper's run.
  •   The Forgotten - Makes it harder to keep The Forgotten's bone heart containers, since every red heart on the floor will be collected and transformed into soul hearts, which can only be used by The Soul.

In-game Footage

Patch Notes

  • Prior to Version 1.02 Dark Bum's red to soul heart conversion rate was 1:1, but it was set to 1.5:1 with Version 1.02.
  • Prior to Version 1.031, Dark Bum did not have a chance to spawn spiders of either kind. This was likely done to nerf its use with characters that start with no or few heart containers.


 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)

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