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

Blighted Ovum is a boss that can appear in Cellar Cellar.


Blighted Ovum starts separated into two parts.

  • Suture is invincible and slowly floats towards Isaac, firing a horizontal 15►Brimstone Brimstone shot whenever Isaac is to its left or right. Suture can not be killed and will die once Contusion does.
  • Contusion constantly chases Isaac while leaving behind a trail of red creep, he periodically charges and gains speed. Unlike Gemini, he will not stop for a breath but slows down to his regular speed.



  • Removed in Afterbirth † Suture can be rerolled by the 15►D10 D10.
  • Removed in Repentance Suture can be killed by Added in Afterbirth †15►Little Horn Little Horn.


  • Blighted Ovum was added in the Wrath of the Lamb DLC for the original The Binding of Isaac.
  • It is the posthumous version of Gemini.
  • In medicine, a blighted ovum is a pregnancy in which the early pregnancy appears normal on an ultrasound scan, but later no visible embryo develops.
  • Removed in Repentance Blighted Ovum has skin on its body in the boss art, but it doesn't in-game.
  • Blighted Ovum is the only boss in chapter 1 that is a posthumous version of another boss.
  • If encountered in a Double Trouble boss fight, its 15►Brimstone Brimstone laser can damage the other boss.
  • In Wrath of The Lamb, when Blighted Ovum was killed Contusion would shoot 8 extremely fast tears in the cardinal and ordinal directions, and after a short delay would be followed up by Suture who would explode similarly.
  • In the Bestiary, Suture is referred to as "The Blighted Ovum Baby".
  • Added in Repentance Blighted Ovum, Big Horn, Triachnid, and ??? (Boss) are the only bosses whose portraits were completely changed in Repentance (beyond simply adding more detail). Of these, only Triachnid, Isaac, and ??? didn't receive new sprites.