Mystery Egg

Mystery Egg is an unlockable passive item added in Booster Pack #5.

Effect

 * Spawns an egg familiar, which cracks and turns into a random friendly enemy when Isaac is hurt.
 * The egg regenerates upon entering a different room.

Synergies

 * : The enemy spawned will be a champion variant and egg grows in size.
 * Even if the enemy spawned cannot be a champion under normal circumstances, they will become a champion. For example, a spawned Dip can become a Red champion while a Round Worm can become a Green champion.

Interactions

 * : Losing the Mantle will not cause a friendly enemy to spawn.

Trivia

 * Mystery Egg is based on this Steam Workshop item by Strawrat and Aczom.