Teratoma is a boss that can appear:
In all environments of Chapter 4 (Womb, Utero,
Scarred Womb).
Only in the Utero.
The large Teratoma has 60 HP, the medium forms have 15 HP, and the small forms have 8 HP, for a total of 153 HP.
Behavior[]
- Moves around the room slowly, bouncing off the walls.
- When enough health is depleted, the one large Teratoma breaks into three medium Teratomas.
- Medium forms behave identically, but move slightly faster.
- Each of the three medium Teratomas breaks into two small Teratomas.
- Small forms behave identically, but move very fast.
- Each of the smallest Teratomas spawns two Spiders on defeat unless they are over a pit or other obstacle.
- All stages of Teratoma will do 1 full heart of contact damage.
Gallery[]
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Teratoma in-game.
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Medium-sized Teratoma.
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Small Teratoma.
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Teratoma's appearance in Corpse. -
Sketches for Teratoma and other bosses for the original Binding of Isaac's Wrath of the Lamb DLC.
Trivia[]
- Teratoma was added in the Wrath of the Lamb DLC for the original The Binding of Isaac.
- It is the posthumous form of Fistula.
- A teratoma is a rare tumor that contains tissues that are atypical for its placement in the body. This can include hair, teeth, bones, and so on.
- Unlike the original Binding Of Isaac, Teratoma doesn't bounce off of Rocks.
Teratoma is one of the three bosses that can be spawned by It Lives, the other two being Chub and Polycephalus.
It Lives can now spawn Fistula as well.





