Mother

This article is about the final boss of Corpse. For the boss of chapter 3 and chapter 3.5, see Mom. • Jacob and Esau - Defeat Mother. • Seeing Double - Defeat Mother. • Isaac's Awakening - Defeat Mother. • Meat Cleaver - Defeat Mother as Isaac. • Yuck Heart - Defeat Mother as Magdalene. • Guppy's Eye - Defeat Mother as Cain. • Akeldama - Defeat Mother as Judas. • Eternal D6 - Defeat Mother as ???. • Bird Cage - Defeat Mother as Eve. • Bloody Gust - Defeat Mother as Samson. • Devil's Crown - Defeat Mother as Azazel. • Tinytoma - Defeat Mother as Lazarus. • 'M - Defeat Mother as Eden. • Lost Soul - Defeat Mother as The Lost. • Blood Puppy - Defeat Mother as Lilith. • Keeper's Sack - Defeat Mother as Keeper. • Lil Portal - Defeat Mother as Apollyon. • Bone Spurs - Defeat Mother as The Forgotten. • Revelation - Defeat Mother as Bethany. • Magic Skin - Defeat Mother as Jacob and Esau. • Dice Bag - Defeat Mother as Tainted Isaac. • Mother's Kiss - Defeat Mother as Tainted Magdalene. • Lucky Sack - Defeat Mother as Tainted Cain. • Number Magnet - Defeat Mother as Tainted Judas. • Ring Cap - Defeat Mother as Tainted ???. • Lil Clot - Defeat Mother as Tainted Eve. • Swallowed M80 - Defeat Mother as Tainted Samson. • Azazel's Stump - Defeat Mother as Tainted Azazel. • Torn Card - Defeat Mother as Tainted Lazarus. • Modeling Clay - Defeat Mother as Tainted Eden. • Crystal Key - Defeat Mother as Tainted Lost. • Adoption Papers - Defeat Mother as Tainted Lilith. • Cursed Penny - Defeat Mother as Tainted Keeper. • Apollyon's Best Friend - Defeat Mother as Tainted Apollyon. • Hollow Heart - Defeat Mother as Tainted Forgotten. • Beth's Essence - Defeat Mother as Tainted Bethany. • Found Soul - Defeat Mother as Tainted Jacob. • Godhead - Earn all 5 / 9 / 10 / 12 Completion Marks on Hard mode as The Lost.

• Using Plan C will kill Mother in time if you have an extra life. Even though Isaac dies well before the animation is complete, the game over screen will pop up almost immediately after the animation ends. If Isaac has an extra life item that revives him outside the room, he will be able to enter the Final Boss Chest without fighting Mother again.
• Killing Mother in this way will not reward the completion mark for the current character if they don't have an extra life.
• Rotten Tomato or any items that inflict Charm can cause Mother's wavy projectiles during the first phase and second phase to target herself.
• The ball of splitting projectiles in Mother's second phase can also collide with Mother. The player can therefore move to the opposite side of Mother after she fires to more easily dodge the attack.
• Unlike most other bosses, Mother has no visible health bar in either of her phases, so it is impossible to tell how much damage you are dealing to her without Spider Mod.
• Suplex! works on Mother, but in Mother's first phase, Isaac can pick up only one of her parts at a time, either her head or one of her arms, and give it a suplex.
• II - The High Priestess will damage Mother even though it can be considered another form of Mom.
• Using Black Hole will not stop Mother's wavy projectiles from proceeding once the black hole has diminished, causing an un-dodgeable attack. Using this item during the fight is highly ill-advised.

• The Ending following this fight reveals Mother to be a grotesque, undead representation of Mom imagined by Isaac before the events of the game.
• This boss originates from the Antibirth mod, and was originally named "The Witness".
• The Witness itself was first designed as a boss mockup by the name of "Ur-Gurdy". The Ur-Gurdy was a speculative posthumous version of Mama Gurdy which was rumored to rarely replace Satan in Sheol.
• Between her original appearance in Antibirth and Repentance, Mother’s boss fight was changed drastically, including the arena being shrunken dramatically, the replacement of several attacks with new ones, the boss theme being changed, and the boss's death animation being changed, along with the addition of Mom’s voice lines during the battle.
• Because of how she died in Antibirth (turning to stone), it was possible to softlock the game by killing The Witness where the ending chest spawned.
• In Antibirth, the Corpse II boss room contained four golden chests with items (similar to the starting room in Chest). In Repentance, the boss room is completely empty except for the hole leading to the fight against Mother.
• Mother's boss theme is called "Morticide". "Morti-" stems from Latin "Mors" which means "death" or "corpse", while "-cide" means "an act of killing", so the track name effectively means "Killing the dead".
• The back wall of the fight is actually part of Mother's model; attempting to summon her via the console will change the wall of the current floor to a Corpse wall.
• Unlike Mom, Mom's Heart, and It Lives, Mother is not instantly killed by using The Bible.
• Mother is one of only three bosses that don't have a visible health bar of their own. The others are Mega Satan and The Beast.
• Faint translucent Chubber projectiles can be seen leading the lines of projectiles in Mother's second phase white line attack.
• In Antibirth, The Witness was immune to Status Effects.
• The interaction of Spirit Sword to the Fistula attack is likely a reference to the "Dead Man's Volley" commonly seen during boss fights in The Legend of Zelda.
• According to _Kilburn, the mega Brimstone laser when starting phase 2 is a reference to The Nuclear Throne, a boss from the game Nuclear Throne.[1]
• Mother beating up Dead Isaacs in one of her attacks could be alluding to how Isaac gets beaten up in life after leaving his room.
• Mother spawning 34 Dead Isaacs might be a reference to there being 34 playable characters.