Mom

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Isaac's Mom is the boss found in the second floor of the third chapter. She is a delusional woman who believes that the hallucination she hears telling her to murder her son is the voice of God.

Defeating Mom for the first time causes mods to no longer disable achievements.

Behavior

Mom's fight takes place in the entirety of the room and always begins with Mom stomping in the center of the room. Four Boss Room doors will emerge on all four sides of the room, and Mom can attack from any of these doors. She can stomp on Isaac, which is telegraphed by a growing shadow and her screaming. All of her attacks will deal a full heart of damage. She can only be hurt by hitting her directly when she exposes her foot, eye, flesh, or hand.

Standing too close to the doors will result in Mom striking with her hand. If the player isn't in reach and she isn't using her foot stomp attack, a piece of flesh will bulge from the doors and spawn various enemies. Occasionally, she may stick her eye out of the door, which is harmless and vulnerable to being attacked by Isaac.

Mom's stomp attack can damage nearby enemies and destroy obstacles, but the foot itself does no contact damage.

Enemies spawned by Mom are:

Once Mom is defeated, all enemies spawned by Mom will die as well, with the exception of Globins.

Champion Variants

Blue: This variant summons monsters more often and only summons various types of enemies added in the Wrath of The Lamb expansion for the original game, including Spiders, Big Spiders, Trites, Buttlickers and Keepers.
Red: This variant does not summon monsters at all, and instead constantly uses her foot stomp. Her eyes can shoot three blood shots at the player when they emerge and she uses her hand much more often.

Gallery

Mom ingame leg.png

Mom's leg in-game.
Mom ingame flesh.png

Mom's flesh in-game.
Mom ingame hand.png

Mom's hand.
Mom ingame eye.png

Mom's eye.
Mom as one of Delirium's forms.

Unlockable Achievements

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Notes

Defeating Mom for the first time will change the current savefile's image.
Using The Bible item during the Mom boss fight will kill her instantly and unlock The Halo.
Using The High Priestess card during the fight with Mom will result in Isaac being stomped instead of the enemy with the highest health.
- Though, if done correctly, one could possibly kill Mom in one hit by using the card while next to Mom's leg.
Mom's stomp attack counts as a bomb; this means Isaac can be immune to it with Pyromaniac or Host Hat.
- With Pyromaniac, Isaac can be healed when stomped.
- Red Mom is nearly impossible to lose against with Pyromaniac or Host Hat.
Mom cannot damage herself with her stomp attack.
Midas' Touch causes Mom's foot to be turned into gold before it lands, giving the player ample time to move out of the way and place bombs or otherwise.
After Mom's foot touches the ground, it is safe to touch no matter what; as opposed to dealing contact damage, it is purely explosive.
The Polaroid is always to the left and The Negative is always to the right, in case Curse Of The Blind is active.

Trivia

Mom is voiced by Patty Allen-Scott.
Mom appeared in the original The Binding of Isaac.
- In the original, Mom's voice was provided by Carla Kihlstedt
- Mom's Leg originally dealt a full heart of damage.
- Unlike in Rebirth, Mom would shout "Isaac!" whenever she exposed her eye.
Mom is one of the two bosses in the game to have a unique design for her name in the Versus screen. The other one is Brownie.
Mom is the only final boss that has champion variants.
How using the Bible kills 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, "Isaac!" from Mom can be heard, despite the battle not starting yet. She is the only boss whose voice can be heard during the versus screen.
If Isaac gets hurt by Mom, her laugh can be heard.
In The Binding of Isaac: Four Souls rendition of Credit Card, the name "Magdalene O. Moriah" can be seen carved in the credit card. Edmund has confirmed that this is indeed Mom's full name.
- 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.
The skirt she wears on her ingame sprite is normally impossible to see in regular play as her leg extends past the screen. Using the Dataminer can make the skirt visible.
In the original, Mom's Foot used to deal contact damage.