Blighted Ovum

The Blighted Ovum is one of the bosses that can appear in The Cellar, and is the posthumous version of Gemini.

Behavior[]

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.

Bosses
Basement	Monstro • Gemini • Dingle • Larry Jr. • The Duke of Flies • Gurglings • Fistula • Steven • Famine
Cellar	Gurdy Jr. • Pin • Widow • Blighted Ovum • The Haunt • Dingle • Larry Jr. • The Duke of Flies • Gurglings • Fistula • Famine
The Caves	Chub • Gurdy • Gurdy Jr. • Mega Maw • Mega Fatty • Dark One • C.H.A.D. • Pestilence
Catacombs	The Hollow • The Husk • Peep • Polycephalus • The Carrion Queen • The Wretched • Dark One • Pestilence
The Depths	The Cage • Monstro II • The Adversary • The Gate • Loki • Gish • War • Mom
Necropolis	The Bloat • The Carrion Queen • Mask of Infamy • The Wretched • The Gate • Loki • War • Mom
The Womb	Mr. Fred • Scolex • Teratoma • Mama Gurdy • The Bloat • Lokii • Death • Conquest • Mom's Heart • It Lives
Utero	Blastocyst • Daddy Long Legs • Teratoma • Mama Gurdy • The Bloat • Lokii • Triachnid • Death • Conquest • Mom's Heart • It Lives
Sheol	The Fallen • Satan
Dark Room	The Lamb • Mega Satan
Cathedral	Isaac
The Chest	??? • Mega Satan
Devil Room	Krampus
Angel Room	Angel
Levels 1-5/7	The Fallen • The Headless Horseman