The Pile

The Pile is one of the bosses that can appear in Chapter 3.

Behavior

 * Pops out of the ground near the player 3 times and throws 5 bones each time.
 * Summons waves of spikes in the cardinal directions.
 * Charges towards the player at high speed. Upon colliding with a wall, bone projectiles and rock waves are sent in all directions.
 * Spawns Bonies.

Trivia

 * The Pile is a posthumous form of Polycephalus, similar to The Stain added in Afterbirth.
 * Despite the fact that The Stain was already in the game, the Pile was also added into Repentance, meaning Polycephalus has two posthumous forms.
 * A third skull can be seen in the background of The Pile's boss art.
 * Antibirth's artist, NotYourSagittarius, first posted a versus screen of this boss and then a full mockup in the Isaac subreddit both in January 2015, which was implemented by antibirth's developer Kilburn into a mod during the same month.