Krampus

Krampus is a mini-boss that can occasionally appear inside of a Devil Room.

Behavior
Krampus moves randomly around the room in cardinal directions and can perform the following attacks: Krampus deals a whole heart of contact damage.
 * Stops and fires lasers in all 4 cardinal  or diagonal directions.
 * The lasers can sometimes rotate 90 degrees in either direction after being shot.
 * Krampus signals rotating lasers by growling and quickly dashing towards Isaac before performing this attack.
 * Fires 3 projectiles in a spread followed by 4 projectiles in a spread in succession towards Isaac.

Trivia

 * His name and appearance are based on Krampus, an alpine folkloric figure. It supposedly acts as a antithesis to Saint Nicholas, punishing children who misbehave near Christmas time.
 * This is most likely why is in his item pool.
 * Krampus is both visually and behaviorally similar to The Fallen, but does not split upon death.
 * Krampus can spawn in Greed Mode without needing to be unlocked.
 * Defeating Krampus when encountered here still unlocks even if Krampus himself has not yet been unlocked.
 * In an AMA subreddit thread for Edmund McMillen, a user questioned why Krampus got "worse with every update." Edmund McMillen jokingly responded, "he's the new bloat."; referencing the general hatred some fans have towards The Bloat.
 * Despite receiving a redesign in Repentance Delirium's Krampus appearance has yet to be updated.