Wormwood

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

Behavior

 * Lunges from a pit towards Isaac, releasing 4 projectiles in the cardinal directions in the air. Wormwood then chases Isaac in a zig-zag pattern, before eventually returning to a pit.
 * If Wormwood lunges out of a pit and lands on top of another large pit, he returns back into that pit.
 * Eats any Bombs dropped in his path while chasing Isaac; stunning him for a moment before dealing considerable damage.
 * Partially emerges from a pit and fires a spray of disorganized projectiles at Isaac before re-submerging.
 * At 33% health, Wormwood pierces the ground with his tail at Isaac's location with a short delay 3-6 times. Pits are created where Wormwood pierces the ground. Afterwards, Wormwood charges out from inside the left or right wall horizontal to Isaac's location while spawning 3 Small Leeches. He then chases Isaac for a short duration before returning to a pit.
 * Wormwood can never create a pit in a spot that would trap Isaac.
 * Wormwood takes increasingly reduced damage after reaching 33% HP until he performs this attack.

Trivia

 * His behavior and appearance is reminiscent to that of Pin making him a possible variant of it.
 * When encountered in the Dross, the color palette of Wormwood and his attacks are altered to fit the floor. Lil Blub also features this.
 * His name is a reference to the Biblical Wormwood. It is a star that, according to the Book of Revelation, will fall on a third of the Earth's water, which will turn the water bitter and deadly to drink.
 * In the Antibirth mod, Wormwood could be encountered as a degraded boss in Corpse, and would take on a red color palette.