Mystery Egg - The Binding of Isaac

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Mystery Egg is an unlockable familiar in The Binding of Isaac, added in the Afterbirth+ DLC.

Spawns an egg familiar that follows Isaac. It cracks and turns into a random friendly enemy when Isaac is hurt.

Regenerates upon entering a different room.

Clearing more rooms without the egg cracking will results in more useful friendly enemies spawned. The most useful enemies are spawned after clearing more than 13 rooms without taking damage.

This page shows the latest information as of the new Repentance+ (Online Co-op) DLC.
To see information about this item for the previous Repentance version, check this page instead.

Spawn 3 charmed (friendly) enemies in the same room.

Mystery Egg can be found in the following item pools:

Name	Weight
Treasure Room	1.0/1.0
Greed Treasure Room	1.0/1.0
Baby Shop	1.0/1.0

The following tags are applied to this item:

Id	Description
nolostbr	Unavailable for The Lost after obtaining Birthright.
summonable	Can be summoned via Lemegeton.

The following special synergies and interactions for Mystery Egg have been documented.

Mod	Item	Synergy
---	BFFS!	The spawned enemy will be a champion variant, even if it normally cannot appear as one.

* Note that not all possible synergies and interactions are listed here.

Below is the Internal Item Description as shown in-game.
Note that some stat changes are not displayed here. Please see the main description for the full effects.

Mystery Egg

• Following familiar that hatches when Isaac takes damage, spawning a permanently charmed monster
• The strength of the monster is increased with each consecutive room cleared without it breaking
• The egg regenerates when entering a new room
• Abyss: x1 locust .5x Isaac's damage