Triachnid

Triachnid is a boss that can appear:
 * In all environments of Chapter 4.
 * Only in the and the.

Behavior
Triachnid's head hangs down stationary and can perform the following attacks:
 * Raises his head making it invulnerable and stomps the ground in random locations around the room 3 times in quick succession, leaving small puddles of slowing White Creep. One of these legs will always stomp on top of Isaac's position.
 * The appendages that he stomps with can be attacked to damage him.
 * Lifts his head off-screen and stomps the ground 3 times at regular intervals on top of Isaac's position. At the end of the stomps, he slams his head down quickly in the center, shooting 8 white projectiles in all directions and creating a large puddle of White Creep. He can only slam his head down along a horizontal plane across the center of the room and slams it down close to Isaac's position.
 * Occasionally performs a fourth stomp before slamming his head down and very occasionally performs a fifth.
 * Occasionally, when he slams his head down, he leaves a larger puddle of White Creep, but only shoots 4 white projectiles in the cardinal directions.
 * The appendages that he stomps with can be attacked to damage him.
 * Spits out a Trite in Isaac's direction.
 * Trites can be killed by Triachnid's stomps and head slam.

Trivia

 * Triachnid was added in the Wrath of the Lamb DLC for the original The Binding of Isaac.
 * In the original Binding of Isaac, Triacnid could be encountered in.
 * Triachnid originated from the 2006 flash game Tri-achnid, which was created by Edmund McMillen.
 * He is an alternative of Daddy Long Legs.
 * Unlike the other alternate bosses (Steven, C.H.A.D., Gish, and Conquest), Triachnid does not drop a specific item.
 * While Daddy Long Legs uses 4 appendages in his attacks, Triachnid is reduced to mostly only using 3; this is most likely in homage to the fact that Triachnid in his title game only had 3 appendages.
 * Triachnid's unlock method is possibly a reference to a bug in the original Wrath of the Lamb that caused Triachnid to occasionally replace Isaac in the Cathedral.
 * Triachnid does not have a death animation.
 * Triachnid can be found in, even before being unlocked.
 * Triachnid, Blighted Ovum and Big Horn are the only 3 bosses who had their splash art changed in Repentance. Of these bosses, Triachnid is the only one that did not receive new sprites.

Triachnid