Chimera

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

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.
 * 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 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.
 * 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.
 * 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 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 before leaping and rolling around the room bouncing off walls, similar to The Cage.
 * If the head is close it can pick the head up and throw it at Isaac, creating a burst of projectiles where the head collides with a wall.
 * If the head dies before the body, the body continuously rolls around like The Cage for the rest of the battle.

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.
 * 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...".