Isaac RebirthKeeper sprite

To see its original effects, see here

Bloody Lust is an unlockable passive item. Samson starts with this item, but Samson must complete the Cathedral to unlock it.


Every time Isaac takes damage, he gains a damage boost. The boost will eventually max out and reset upon entering the next floor.

  • When Isaac is hit for the first three times, his damage increases by 0.5 each time he is hit.
  • The next three times Isaac is hit, his damage increases by 1.66 each time.
  • After taking damage six times, further damage will not increase damage.
  • Isaac will become redder and redder as he takes damage.



  • IV Bag: Allows Isaac to increases his damage at anytime at the cost of red hearts.
  • Libra: As damage increases, Isaac's other stats will increase as well.


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