| The Cellar|
The Blighted Ovum starts off separated into two parts.
- The spirit sibling is invincible and slowly floats towards the player, firing a horizontal Brimstone shot whenever the player is to its left or right.
- The larger sibling constantly chases the player and progressively gets faster, while leaving behind a trail of red creep. Unlike Gemini he will not stop for breath, only slow down.
- The Blighted Ovum was added in the Wrath of the Lamb DLC for the original Binding of Isaac.
- 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.
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