Binding of Isaac: Rebirth Wiki

Added in Repentance

Sumptorium is an unlockable activated item added in The Binding of Isaac: Repentance.


  • When used by any character other than Tainted Eve Tainted Eve, removes half a heart of health upon use and creates a Clot familiar.
    • Blood clot familiars mimic Isaac's movement (including flight), firing, and tear effects.
    • Blood clot familiars will mimic all tear-altering effects, such as Spirit Sword Spirit Sword.
    • Holding down the swap button allows Isaac's to move independently from the blood clots.
      • The familiars have health and will be destroyed if they take enough damage. They start with 15 HP when spawned and slowly decay down to 1 HP (5 HP for non-red hearts) over time, similarly to Minisaacs from Giant Cell Giant Cell.
        • They are immune to hazards such as spikes, fire places, and lasers.
        • Enemies deal 1 point of contact and projectile damage to them when hit.
        • Isaac's bombs and troll bombs deal 2 points of damage.
      • Draining health does not count as taking damage, so creating familiars will not trigger damage-activated effects.
  • Each type of heart generates a different type of blood clot:
Heart Appearance Damage Tear effect
Red Heart.png Sumptorium red familiar.png 35% n/a
Soul Heart.png Sumptorium soul familiar.png 35% n/a
Black Heart.png Sumptorium black familiar.png 43% Dark Matter Dark Matter
Eternal Heart.png Sumptorium eternal familiar.png 52% Sacred Heart Sacred Heart
Gold Heart.png Sumptorium golden familiar.png 35% Midas' Touch Midas' Touch (scales with luck)
Bone heart.png Sumptorium bone familiar.png 35% Compound Fracture Compound Fracture
Rotten Heart.png Sumptorium rotten familiar.png 35% n/a

For Tainted Eve Tainted Eve only:

  • Passively, holding down the fire button will create blood clot familiars every two seconds and drain half a heart.
  • Upon activation, Sumptorium destroys any remaining blood clots and heals Tainted Eve for the same type of hearts that were used to generate them. The blood clots deal 3x Tainted Eve's damage to enemies they pass through as they return.
    • Should Tainted Eve have more blood clots than room in her health bar when doing this, all excess blood clots will drop next to her.
  • The charge time is only 1 second rather than 10 seconds.


  • The type of heart drained first is decided by the following order: Golden Hearts, Eternal Hearts, Rotten Hearts, Red Hearts, then the rightmost Soul, Black, or Bone Hearts.
  • Clots from a previous run will carry over during a RERUN.
  • Sumptorium can't spawn more than 64 clots at once.
    • This limit is shared with blue flies and blue spiders. If there are multiple flies, spiders and clots on the screen at the same time, the limit will be 32 for the clots and 32 for the flies/spiders.
  • Sumptorium cannot absorb more than 29 clots at once.
  • Activating Sumptorium does not restore Tainted Eve's health immediately, as it is not restored until the recalled blood clots return to Eve.
  • If Isaac obtains flight, the clots will hover instead of moving across the floor.
  • Clots scale with Isaac's size.



  • Book of Virtues Book of Virtues: It will create red wisps for every clot consumed, and they will disappear if she starts creating clots again. Soul charges cannot be used to create wisps.
  • Box of Friends Box of Friends: Cannot be used to duplicate clots.
  • Car Battery Car Battery: Summons 2 clots instead of one for double the health cost. Not Recommended for Tainted Keeper Tainted Keeper as it can instantly kill him.
  • The Forgotten The Forgotten: In order to stop clots from moving while playing as The Forgotten The Forgotten, it is needed to hold down Left CTRL/RT while switching to The Soul The Soul, and vice-versa.
  • Keeper Keeper/ Tainted Keeper Tainted Keeper: Coin hearts count as Red hearts.
  • Lazarus Lazarus/Revival Items: Clots will be retained after losing the extra life.
  • The Lost The Lost/ Tainted Lost Tainted Lost: Sumptorium kills The Lost and Tainted Lost immediately upon use.
  • My Reflection My Reflection: Clots' tears will be redirected to Isaac instead of returning back to them.
  • Strawman Strawman: Clots will follow Strawman instead of Isaac if they were spawned in a previous room.
  • Tainted Eden Tainted Eden: Clots made by Sumptorium are retained after taking damage.
  • Tainted Forgotten Tainted Forgotten: Clots made by Sumptorium have a club too, but they are commanded by Tainted Soul Tainted Soul, making it the only way to attack while moving freely.
  • Tractor Beam Tractor Beam: Clots' tears will be fired from Isaac instead, and will stay within the tractor beam.
  • Void Void: Absorbing this item will consume all clots made earlier, but will not generate new clots.

Interactions with Tainted Eve Tainted Eve[]

  • Alabaster Box Alabaster Box: Sumptorium can create clots by using hearts inside the box. It prioritizes hearts inside the box instead of using Eve's soul or black hearts.
  • Lil Clot Lil Clot: The clot spawned by this trinket is its own separate clot variant although it functions the same as the red one. As such, it cannot be absorbed by Sumptorium.
  • Maggy's Bow Maggy's Bow: Does not provide additional healing when absorbing clots.

In-game footage[]



  • A Sumptorium is a metal drinking straw used in the Roman Rite to receive the Blood of Christ in Holy Communion.
  • Even though Tainted Eve wields a Sumptorium-like weapon when left on half a heart and all blood clots are destroyed, this is not an effect given by the Sumptorium item itself and is a character-specific trait.