Teratoma

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.
 * In all environments of Chapter 4.
 * Only in the.

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.

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 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 four bosses that can be spawned by It Lives, the other three being Fistula (as of Repentance), Chub and Polycephalus.
 * An unused rotten version of Teratoma exists in the files that may have been used in Mother's fight similar to the Fistula ball.