Binding of Isaac: Rebirth Wiki

Disambig.png This article is about the boss. For the transformation, see Yes Mother (Transformation). For other uses, see Mom (Disambiguation).

Mom is the boss that appears on the second floor of Chapter 3 (Depths Depths, Necropolis Necropolis, Added in Afterbirth Dank Depths Dank Depths). She is the initial final boss of the game, and defeating her for the first time unlocks both the Epilogue ending and Chapter 4 (Womb Womb).


Mom appears in a unique boss room that has a boss door in the center of all sides of the room. Mom can use these doorways to perform various attacks:

  • Stomps on Isaac's position, damaging nearby enemies and destroying obstacles. This attack is telegraphed by a growing shadow and her grunting.
    • She always begins the fight by stomping in the center of the room.
    • Removed in Repentance Stomping is considered as explosion damage.
      • Added in Repentance Stomping is now considered as contact damage in Repentance.
    • The foot itself does no contact damage.
      • Added in Repentance Changed to deal contact damage in Repentance.
  • If Isaac is near a door, Mom reaches out from it with her hand, dealing contact damage.
  • Sticks out a piece of flesh from a door and spawns a Monster with a maximum of 3 alive at once:
Gusher Gusher
Frowning Gaper Frowning Gaper
Globin Globin
Attack Fly Attack Fly
Pooter Pooter
Mulligan Mulligan
Maggot Maggot
Charger Charger
Horf Horf
Maw Maw
Red Maw Red Maw
Clotty Clotty
  • Sticks an eye out of a door, which does not attack but can deal contact damage.
  • Upon Defeat, all enemies spawned by Mom die alongside her, except for Globins, which collapse into piles of goo.

Mom deals one heart of contact damage.

Added in Repentance Behavior in Mausoleum/Gehenna[]

A stronger version of Mom can be fought on the second floor of the Mausoleum Mausoleum and Gehenna Gehenna. This version of Mom has noticeably bluer veins on her leg and stronger variations of her attacks:

  • Stomps 3 times on Isaac's position in rapid succession, with the third stomp releasing explosions in the cardinal directions.
    • If an eye is already attacking, only 1 stomp will be performed.
    • She always begins the fight by stomping once in the center of the room, just like in Chapter 3.
  • Sticks an eye out of a door, and if Isaac is in line of sight, it shoots 2 Brimstone Brimstone beams in a helix pattern towards the door on the opposite side.
    • If Mom had already initiated the 3-stomp attack, the eyes opened during it won't fire the beams.
  • Sticks out a piece of flesh from a door and spawns a Monster:
Attack Fly Attack Fly
Added in Repentance Cursed Globin Cursed Globin
Added in Repentance Fetal Demon Fetal Demon
Added in Afterbirth Rag Man's Ragling Rag Man's Ragling
Sucker Sucker
Psychic Horf Psychic Horf
  • Unlike in Chapter 3, Mom never uses her hand attack.
  • Upon Defeat, all enemies spawned by Mom die alongside her, except for Cursed Globins, which collapse into 2 piles of goo.

Mom deals a whole heart of contact damage. This version of Mom never spawns as a champion.

Champion Versions Needs to be unlocked[]

Blue: Has 793.4 HP (23% more), summons monsters more often and summons a different variation of enemies that were added in the Wrath of The Lamb expansion of the original game, which are:
Spider Spider
Big Spider Big Spider
Trite Trite
Buttlicker Buttlicker
Keeper Keeper
Red: Does not summon monsters at all, and instead repeatedly uses her foot stomp, which has increased speed. Occasionally, she will pause her stomps briefly to use one or both of the following attacks:
  • Stick an eye out from one the doors, which shoots three blood shots in a spread formation at Isaac.
  • Reaches in with her hand through one of the doors, dealing contact damage, if Isaac is close enough to one.



Mom calling Isaac by name.
One of the grunts Mom makes preceding her stomp attack.
Mom laughing after landing a hit on Isaac.
Mom wailing upon defeat.

Unlockable Achievements[]


  • Defeating Mom for the first time changes the current savefile's image and will allow you to obtain unlocks with mods enabled.
  • Using The Bible The Bible or Added in RepentanceXV - The Devil? XV - The Devil? during the Mom boss fight kills her instantly and unlocks The Halo The Halo.
  • Using II - The High Priestess II - The High Priestess during the fight with Mom results in Isaac being stomped instead of the enemy with the highest health.
    • Though, if done correctly, one could kill Mom in one hit by using the card while next to Mom's leg.
  • Removed in Repentance Mom's stomp attack counts as a bomb; this means Isaac can be immune to it with Pyromaniac Pyromaniac or Added in AfterbirthHost Hat Host Hat.
    • Removed in Repentance With Pyromaniac Pyromaniac, Isaac can be healed when stomped.
    • Removed in Repentance Red Champion Mom is greatly negated with Pyromaniac Pyromaniac or Added in AfterbirthHost Hat Host Hat.
    • Added in Repentance Mom's stomp attack now deals contact damage, causing immunity to explosions to no longer avoid damage from the stomp.
  • Mom cannot damage herself with her stomp attack.
  • Midas' Touch Midas' Touch causes Mom's foot to be turned into gold before it lands.
  • The Polaroid The Polaroid is always to the left and The Negative The Negative is always to the right, in case Curse Of The Blind is active.
  • Upon defeating Mom, all of the boss doors of the arena will disappear, trapping Isaac in the room unless you use a teleport card, a Telepill, or an active item that teleports you to escape from the boss room.


  • In The Binding of Isaac: Four Souls rendition of Credit Card, the name "Magdalene O. Moriah" can be seen carved in the credit card. The name was reused on Four Souls+ rendition of Added in Afterbirth †Divorce Papers Divorce Papers. Edmund has confirmed that this is indeed Mom's full name.
    • The initials happen to spell out "M.O.M.".
    • Added in Repentance This is further confirmed in-game during the background conversation during the Ascent, where Dad calls Mom "Maggy" as he tells her to shut up.
      • The last name "Moriah" is likely a reference to the biblical location of the same name. In the bible, it is said that Moriah is where Abraham almost sacrificed his son before God sent an angel to stop his hand.
  • According to Edmund, the occupations of Mom and Dad are stay-at-home mom and handyman respectively.
  • Mom is voiced by Carla Kihlstedt.
  • Mom appeared in the original The Binding of Isaac.
    • In the original, Mom's voice was provided by Patty Allen-Scott
    • Mom's Leg originally dealt a full heart of damage.
    • Unlike in Rebirth, Mom would shout "Isaac!" whenever she exposed her eye.
    • The battle theme in the original game was "Thine Wrath..."
  • The battle theme for this boss is "Matricide", a term for the killing of one's own mother.
  • Mom is the only final boss that has Champion variants.
  • Using the The Bible The Bible and killing Mom instantly is a reference on how a bible hits her head in the epilogue of the game, knocking her out or killing her.
  • During the versus screen, the "Isaac!" line from Mom can be heard, despite the battle not starting yet. She is one of Removed in Repentance seven/Added in Repentance five bosses that can be heard during the versus screen; the other Removed in Repentance six/Added in Repentance four are Added in Afterbirth † Big Horn Big Horn, Added in Afterbirth The Stain The Stain, Added in Afterbirth The Forsaken The Forsaken, Removed in Repentance Mom's Heart Mom's Heart, Removed in Repentance It Lives It Lives and Added in Repentance Mother Mother.
  • If Isaac gets hurt by Mom, she will laugh.
  • The skirt she wears on her in-game sprite is difficult to see in regular play, as her leg extends past the screen. Using the Added in Afterbirth †Dataminer Dataminer or the Added in RepentanceMeat Cleaver Meat Cleaver can make the skirt visible.
    • Added in Afterbirth † Delirium's Mom form appears to wear a pile of flesh and organs rather than a skirt.
  • Although Mom can't damage herself with her stomp attack, she still makes the same pained groan as when she takes damage if the stomps on her hand.
  • A disembodied version of Mom's leg stomp attack can be summoned as apart of the effects of II - The High Priestess II - The High Priestess, Added in Afterbirth †Broken Shovel Broken Shovel, and Added in RepentanceII - The High Priestess? II - The High Priestess?.
  • Added in Afterbirth † Defeating Mom for the first time causes mods to no longer disable achievements.
  • Added in Afterbirth † Prior to Booster Pack #5, Globins spawned by Mom could turn into Added in Afterbirth Dank Globin Dank Globins if she was fought in Dank Depths.
  • Added in Repentance When she is fought in the Mausoleum Mausoleum, her leg appears to be in a much more sickly state; with many varicose veins lining it.
    • Her hand also has a unique updated sprite despite the fact that she never uses it in this fight.
  • Added in Repentance Mother could be considered as her posthumous version.