Chimera

Chimera is a boss added in The Binding of Isaac: Repentance that can appear in the Corpse.

Behavior

Phase 1

Chimera trots quickly in Isaac's direction, slowly building up speed. When fast enough, it leaves a trail of harmful Green Creep and makes wide turns due to its momentum. It can also perform the following attacks:

Spits out 5 Small Maggots.
- Any Small Maggots it walks into are killed.
- Unlike its other attacks, Chimera can perform this one without interrupting its chase and its built up speed.
Spits out a Sick Boom Fly and throws it towards Isaac.
Jumps twice towards Isaac, shooting out a radius of 8 tears on the first landing and 4 rock waves in diagonal directions on the second landing.
Shoots out 8 Ipecac shots towards where Isaac is predicted to move. The landing position of each projectile is marked on the ground.

Phase 2

Once its HP has dropped to about half, it makes a final charge towards Isaac before tripping and dividing the head and body into separate entities. It will take increasingly reduced damage as it approaches 50% HP until it transitions phases.

The head continuously makes leaps towards Isaac and slides a distance after landing while leaving a trail of damaging Red Creep. It can also perform the following attacks:
- Shoots out 4 spreads of 5 projectiles in Isaac's direction.
- Performs three quick dashes, similar to Dingle, leaving Red Creep. The first 2 dashes are towards Isaac while the final dash is towards its body. After completing the final dash the body can pick the head up and throw it at Isaac, leaving a trail of projectiles as it travels and creating a burst of projectiles where the head collides with a wall.
  - If the body is performing another attack during the head's charges, the head will charge at Isaac for its third charge instead.
- If the body dies before the head, it continuously makes long charges at Isaac, bouncing off any walls while also leaving Red Creep.

The body continues to chase Isaac like the first phase but at a slower pace. It can also perform the following attacks:
- Fires a green-hued Brimstone beam downwards if Isaac is directly above or below it. It is propelled upwards by this beam until it hits the wall.
- Runs quickly towards Isaac building momentum before leaping and rolling around the room bouncing off walls, similar to The Cage.
- If the head dies before the body, the body continuously rolls around like The Cage for the rest of the battle.

Gallery

Chimera in-game.
Chimera's head in its second phase.
Chimera's body in its second phase.
Chimera's old splash art in Antibirth.
Concept sketches of Chimera's attacks.

Trivia

Chimera lends its name to the fact that it is a mix of three other bosses.
- It has the body of The Cage.
- It has the head of either Gurglings, Gurdy Jr., or Gurdy.
- It has the face of Monstro.
- It has behavior similar to that of all bosses stated above.
A Chimera in Greek mythology is a monstrous creature composed of a lion, goat, and snake.
- "The term "chimera" has come to describe any mythical or fictional creature with parts taken from various animals...".
- "Chimera" is also the medical term for a human or animal that possesses more than one set of DNA.

Bugs

Bug!	Chimera's head will occasionally disappear once the body is killed, rendering them unbeatable unless the player exits the game and continues the run.