Repentance · familiar · #539

Mystery Egg

An egg familiar hatches an allied enemy after Isaac takes damage.

Typefamiliar
Quality1
Listed pools2
UnlockAchievement #387

In-game pickup line

“Sacrificial insemination”

Mechanics

What Mystery Egg does

  • A hit breaks the egg and releases a friendly enemy.
  • Clearing more rooms without taking a hit improves the potential strength of what hatches.

Achievement #387

How to unlock it

Spawn three charmed enemies in the same room.

Unlocking an item and finding it during a run are separate steps.

Explore more unlocks

In a run

Practical note

Preserve a long no-hit streak before a difficult room to improve the hatch.

Reference

Game data and sources

The item ID, quality and pool listings, icon, game-file tags, and short pickup line come from the extracted Repentance files. This effect explanation is an editorial summary checked against the references below. Repentance+ can differ.