Mystery Egg

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Item icon
Item altar
 
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5.100.539
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Treasure Room Treasure Room
Greed mode only Treasure Room Treasure Room
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(page 5, column 14, row 3)
 
Mystery Egg Spawn three charmed enemies in the same roomMystery EggMystery Egg
Added in Afterbirth †

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

Effect[edit | edit source]

  • 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.

Notes[edit | edit source]

  • The usefulness of the enemy depends on how many rooms have been cleared without getting hurt.
  • The list of available monsters is as follows:
Number of rooms / waves cleared Monsters
0 to 1 rooms cleared without taking damage Black Fly, Attack Fly, Maggot, Spider, Dip, Embryo, Nerve Ending
2 to 4 rooms cleared without taking damage Moter, Pooter, Swarm Fly, Level 2 Fly, Full Fly, Horf, Sucker, Dart Fly, Big Spider, Guts, Hopper, Gusher, Round Worm, Heart, Gush
5 to 7 rooms cleared without taking damage Squirt, Ragling, Homunculus, Level 2 Spider, Small Baby Long Legs, Wall Creep, Nightcrawler, Ulcer, Ministro, Mulligan, Hive, Nest, Flaming Hopper, Gaper, Cyclopia, Skinny, Dople, Globin, Maw, Psychic Horf, Tumor, Fatty, Half Sack, Clotty, Charger, Brain, Conjoined Spitty, Buttlicker, Host, One Tooth, Baby, Dukie, Black Globin's Body, Black Globin's Head, Para-Bite
8 to 10 rooms cleared without taking damage Splasher, Boom Fly, Keeper, Fat Bat, Psy Tumor, Imp, Fred, Cod Worm, Lump, Swinger, Bony, Black Globin, Null, Begotten, Knight, Bone Knight, Blubber, Conjoined Fatty, Oob, Leech, MemBrain, Wizoob, Mr. Maw, Flesh Death's Head, Mushroom, Blind Creep, The Thing, Blister, Leaper, Hanger, Poison Mind, Fistuloid, Tar Boy
11 to 13 rooms cleared without taking damage Gurgle, Walking Gut, Black Bony, Black Maw, Camillo Jr., Eye, Roundy, Mom's Hand, Mega Clotty, Swarmer, Fat Sack, Mobile Host
More than 13 rooms cleared without taking damage Red Ghost, Rage Creep, Vis, Gurglings, Dinga, Portal

Synergies[edit | edit source]

  • BFFS! BFFS!: 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[edit | edit source]

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

In-game Footage[edit | edit source]

Trivia[edit | edit source]

Bug[edit | edit source]

Bug Bug! When using Extension Cord Extension CordTrinket Extension Cord icon.pngBeams of yellow electricity flow between Isaac and his familiars, damaging any enemies between them. with Mystery Egg, after the egg turns into a friendly enemy, the electricity shoots out into a random corner of the room.
Bug Bug! When egg turns into a friendly Heart (Mask + Heart) will sometimes act as the heart companion for a mask already in the room resulting in an unbeatable room.

Gallery[edit | edit source]


Collectible Moving Box icon.png Booster Packs Collectible Moving Box icon.png
#1
  • Collectible Angry Fly icon.png
  • Collectible Black Hole icon.png
  • Collectible Bozo icon.png
  • Collectible Broken Modem icon.png
  • Collectible Mystery Gift icon.png
  • Collectible Sprinkler icon.png
  • Collectible Fast Bombs icon.png
  • Collectible Buddy in a Box icon.png
  • Collectible Lil Delirium icon.png
  • HairpinHairpinFully recharges Isaac's active item upon entering a boss fight.
  • Wooden CrossWooden CrossGrants a Holy Mantle shield upon entering a new floor, which protects against one hit of damage.
  • Butter!Butter!Using an active item will drop it onto a pedestal on the ground. Taking damage may result in dropping a passive item.
  • Huge GrowthHuge GrowthMakes Isaac large for the current room, increasing his range and damage.
  • Ancient RecallAncient RecallSpawns 3 random cards.
  • Era WalkEra WalkFor the current room, enemies are slowed, Isaac's speed is increased, and his shot speed is decreased.
#2
  • Collectible Jumper Cables icon.png
  • Collectible Coupon icon.png
  • Collectible Telekinesis icon.png
  • Collectible Moving Box icon.png
  • Collectible Technology Zero icon.png
  • Collectible Leprosy icon.png
  • Filigree FeatherFiligree FeatherAngels drop items instead of key pieces when defeated.
  • Dressing Table.png
#3
  • Collectible 7 Seals icon.png
  • Collectible Mr. ME! icon.png
  • Collectible Angelic Prism icon.png
  • Collectible Pop! icon.png
  • Door StopDoor StopThe last door Isaac went through stays open, allowing him to leave the room even if enemies are in it.
#4
  • Collectible Death's List icon.png
  • Collectible Haemolacria icon.png
  • Collectible Lachryphagy icon.png
  • Collectible Trisagion icon.png
  • Collectible Schoolbag icon.png
  • Extension CordExtension CordBeams of yellow electricity flow between Isaac and his familiars, damaging any enemies between them.
  • Cross Grimace.png
  • Fistuloid.png
  • Gush.png
  • Soul Sucker.png
  • Tar Boy.png
  • Tube Worm.png
#5
  • Collectible Blanket icon.png
  • Collectible Sacrificial Altar icon.png
  • Collectible Lil Spewer icon.png
  • Collectible Marbles icon.png
  • Collectible Mystery Egg icon.png
  • Collectible Flat Stone icon.png
  • Collectible Marrow icon.png
  • Collectible Slipped Rib icon.png
  • Collectible Hallowed Ground icon.png
  • Collectible Pointy Rib icon.png
  • Collectible Book of the Dead icon.png
  • Collectible Dad's Ring icon.png
  • Collectible Divorce Papers icon.png
  • Collectible Jaw Bone icon.png
  • Collectible Brittle Bones icon.png
  • Collectible Broken Shovel 1 icon.png
  • Collectible Broken Shovel 2 icon.png
  • Collectible Mom's Shovel icon.png
  • Rotten PennyRotten PennySpawns a blue fly every time a coin is picked up.
  • Baby-BenderBaby-BenderGrants Isaac's familiars homing shots.
  • Finger BoneFinger BoneGrants a chance to gain a bone heart upon taking damage.
  • The Forgotten App.png
  • Crispy.png
  • Cross Stoney.png
  • Dank Charger.png
  • Leper.png
  • Leper Flesh.png
  • Mr. Mine.png
  • Mr. Red Maw.png
  • Boss The Matriarch.png
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