Mom's Heart
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Boss    
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| End Chest | |
 Defeat Mom
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Mom's Heart is the final boss in the second floor of the fourth chapter. Until It Lives is unlocked, Mom's Heart cannot be continued past unless a Devil Room or an Angel Room appears, which allow you to go to Sheol or The Cathedral, respectively. After being killed 11 times, Mom's Heart will be permanently replaced by It Lives.
Mom's Heart doesn't drop any items or pickups upon death besides hearts.
Behavior[edit | edit source]
Mom's Heart acts very differently from the original Binding of Isaac.
At the beginning of the fight, Mom's Heart will always be accompanied by two Eyes.
After a while, Mom's Heart will retreat upwards and launch four diagonal lines of red projectiles in a spread that slowly rotate, at which point it cannot be harmed, even if the Eyes that spawn with it hadn't been killed yet. After these Eyes are killed, Mom's Heart will spawn a wave of various enemies of the same type, which can be:
Eyes will always be the first wave spawned after the two Eyes that accompany Mom's Heart are killed.
After killing an entire wave, Mom's Heart will lower itself again and shoot red projectiles in different patterns, which include:
- 10 projectiles in all directions that expand outwards either continously or in a pulsating manner.
- 3 pulsating curved lines of projectiles that rotate and expand outwards.
- 2 rings of ten projectiles that pulsate outwards at different intervals.
- A single line of projectiles that follows Isaac.
- 8 slightly curved lines of projectiles that rotate and expand outwards.
- 5 lines of projectiles that mimic Isaac's movements (these lines have no space between projectiles).
- 4 curved lines of projectiles that continously rotate and expand outwards.
After shooting enough projectiles, Mom's Heart will retreat upwards again and spawn another wave of enemies.
After losing 40% of it's health, Mom's Heart will beat faster and no longer retreat upwards, and it will shoot projectiles and spawn enemies simultaneously. However, all of its attacks can hurt its minions, which often results in them being killed quickly.
After losing 90% of its health, Mom's Heart will stop spawning enemies and will begin to shoot four diagonal 
Brimstone lasers that rotate either clockwise or counterclockwise. At the very top of the boss room is a small area where walking into it counts as though Isaac walked into the heart.
Upon defeat Mom's Heart fires a single ring of 14 projectiles.
Gallery[edit | edit source]
Mom's Heart ingame.
Mom's Heart as one of Delirium's forms.
Unlockable Achievements[edit | edit source]
Rubber Cement - Defeat Mom's Heart 2 times.
A Noose - Defeat Mom's Heart 3 times.
Solar System - Defeat Mom's Heart 3 times.
Wire Coat Hanger - Defeat Mom's Heart 4 times.
Everything Is Terrible!!! - Defeat Mom's Heart 5 times.
Ipecac - Defeat Mom's Heart 6 times.
Experimental Treatment - Defeat Mom's Heart 7 times.
A Quarter - Defeat Mom's Heart 8 times.
A Fetus in a Jar - Defeat Mom's Heart 9 times.
Demo Man - Defeat Mom's Heart 9 times.
??? - Defeat Mom's Heart 10 times.
It Lives! - Defeat Mom's Heart 11 times.
Darkness Falls - Defeat Mom's Heart 11 times.
Suicide King - Defeat Mom's Heart 11 times.
Wrapped Baby -
Defeat Mom's Heart on Hard mode as Azazel
Defeat Mom's Heart on Hard mode as Lazarus.
Begotten Baby - Defeat Mom's Heart on Hard mode as Lazarus Defeat Mom's Heart on Hard mode as Azazel.
Godhead - Earn all
5 / 9 (except the cent sign for Ultra Greed) / 10 completion marks on Hard mode as The Lost.
Notes[edit | edit source]
- Every time Mom's Heart is defeated changes the current savefile's image until It Lives is unlocked.
- Using
The Bible against Mom's Heart will kill it instantly.
Trivia[edit | edit source]
- Mom's Heart appeared in the original The Binding of Isaac.
- The music that plays during this fight is titled Ventricide. Ventricide is a made-up word formed from the word ventricle (one of the two larger chambers of the heart) and the suffix -cide, which denotes an act of killing. This theme is used in other tracks, such as Matricide, Hericide, and Infanticide.
- If Isaac gets hit by Mom's Heart's Brimstone attack, Mom's laugh can be heard.
Mom's Heart can appear in the nightmare boss wave of Chapter 4 in Greed/Greedier Mode, even after being replaced by It Lives in Normal and Hard Mode.
- Similarly, Mom's Heart can appear as a random boss in
The Void, even after being replaced by It Lives in Chapter 4.
- As of Booster Pack #5, since it is required to defeat It Lives 30 times to unlock the Scarred Womb, Mom's Heart can no longer appear in that environment.
- In the original Binding Of Isaac, all Mom's Heart did was spawn 2-4 monsters before disappearing and repeating the same move each time the wave of monsters were killed off.
- During the versus screen, Mom's Heart's enemy-spawning sound can be heard. Mom's Heart is one of six bosses that can be hear during the versus screen, the other five being The Stain, The Forsaken, Big Horn, Mom and It Lives.
Bugs[edit | edit source]
Bug! Sometimes, if the boss intro is skipped, the game will not teleport Isaac into the center of the bottom of the room, resulting in immediate contact damage with one of the Eyes or Mom's Heart, depending on the direction of the room's entrance. Mom Unlocks
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