The Hollow

The Hollow is a boss that can appear in.

It has 22 HP per segment.

Behavior
The number of individual The Hollow bodies that can spawn each fight can vary from 1-4. The most common encounter with The Hollow is with 2 bodies. There is a chance that a Grub can spawn alongside a shorter Hollow (basically replacing a second Hollow).
 * Flies around the room diagonally, bouncing off of walls.
 * The Hollow appears to travel faster when moving at verticle angles compared to horizontal.
 * The Hollow can change direction if it collides with Isaac.
 * Occasionally spawns poop while moving.
 * The Hollow's segments can be split into smaller copies of the boss as long as the new Hollow segments are longer than 2 pieces.

Champion Versions

 * Dark Grey: 15% larger and has 25% more HP (27.5). Each segment that isn't the head spawns a Boom Fly when killed.
 * The head will spawn a Boom Fly only if killed immediately after spawning.
 * Gold: 15% larger and has 25% more HP (27.5). Each segment that isn't the head will drop a coin on death.
 * The head will drop a coin only if killed immediately after spawning.
 * Green: Chance for each segment that isn't the head to spawn a Charger on death. Occasionally stops movement to shoot 3 bullets at wherever it is facing.
 * The head will spawn a Charger only if killed immediately after spawning.

Trivia

 * The Hollow was added in the Wrath of the Lamb DLC for the original The Binding of Isaac.
 * It is the posthumous version of Larry Jr..
 * The definition of hollow is empty on the inside or surface, which could explain the boss's paleness and complexion.
 * The Hollow is the only boss that has three Champion versions.
 * The Hollow is the only regular boss that can be spawned by Mega Satan between thresholds.

Bugs
The Hollow