Binding of Isaac: Rebirth Wiki

Teratoma is a boss that can appear:

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 SpiderSpiders on defeat unless they are over a pit or other obstacle.
  • All stages of Teratoma will do 1 full heart of contact damage.

Gallery[ | ]

Trivia[ | ]

  • Teratoma was added in the Wrath of the Lamb DLC for the original The Binding of Isaac.
  • It is the posthumous form of Boss Fistula ingameFistula.
  • 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.
  • (except in Repentance) Teratoma is one of the three bosses that can be spawned by Boss It Lives ingameIt Lives, the other two being Boss Chub ingameChub and Boss Polycephalus ingamePolycephalus.
    • (in Repentance) It Lives can now spawn Fistula as well.