It Lives
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It Lives is an unlockable alternative form of Mom's Heart. After being unlocked, it will always appear as the boss of the second floor of the fourth chapter, permanently replacing Mom's Heart. It is a stronger version of Mom's Heart that summons bosses alongside regular chapter 4 enemies.
Killing It Lives doesn't drop any items, just hearts. However, it does open up entrances to both Sheol and the Cathedral, as well as the 
Blue Womb if beaten in under 30 minutes.
Behavior[edit | edit source]
It Lives behaves exactly like Mom's Heart, with the additon of being able to spawn Knights and three bosses from previous chapters. These three bosses are:
It also shoots a few extra tears when retreating upwards after spawning enemies/bosses.
Gallery[edit | edit source]
It Lives ingame.
It Lives as one of Delirium's forms.
Unlockable Achievements[edit | edit source]
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Wrapped Baby -
Defeat Mom's Heart on hard mode as Azazel
Defeat Mom's Heart on hard mode as Lazarus.
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Begotten Baby - Defeat Mom's Heart on hard mode as Lazarus
Defeat Mom's Heart on hard mode as Azazel.
Beat Notes[edit | edit source]
- Just like Mom and Mom's Heart, using The Bible against It Lives will kill it instantly.
- Isaac can still encounter It Lives in Greed Mode if it has not been unlocked.
Trivia[edit | edit source]
- The music that plays during this fight is titled Ventricide.[1] Ventricide is a made-up word formed from the word ventricle (chamber 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.
- Ventricide could also be a junction of the prefix ventr-, which could denote "belly", "stomach", or "womb" with the suffix -cide.
- It Lives, according to the developers, takes the shape of what Isaac looked like as a fetus.
- It Lives makes the same sounds as Mom's Heart.
- Like Mom's Heart, if Isaac takes damage from It Lives' Brimstone attack, Mom's laugh can be heard.
- The unlock note for It Lives states "Your futures past awaits.", referencing Time Fcuk, another game by Edmund Mcmillen.
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 It Lives, depending on the direction of the room's entrance.References[edit | edit source]
Bosses 
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Chapter 1  
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Blighted Ovum • Dingle • The Duke of Flies • Famine • Fistula • Gemini • Gurglings • The Haunt • Larry Jr. • Monstro • Pin • Steven • Widow Dangle • Little Horn • Rag Man • Turdlings
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Chapter 2  
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Carrion Queen • C.H.A.D. • Chub • Dark One • Gurdy • Gurdy Jr. • The Hollow • The Husk • Mega Fatty • Mega Maw • Peep • Pestilence • Polycephalus • The Wretched The Forsaken • The Frail • The Stain Big Horn • Rag Mega
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Chapter 3  
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The Adversary • The Bloat • The Cage • The Gate • Gish • Loki • Mask Of Infamy • Monstro II • War • Mom Brownie Sisters Vis
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Chapter 4  
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Blastocyst • The Bloat • Conquest • Daddy Long Legs • Death • Lokii • Mama Gurdy • Mr. Fred • Scolex • Teratoma • Triachnid • Mom's Heart • It Lives Sisters Vis • The Matriarch
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Blue Womb
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Hush
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Chapter 5 
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Satan • Isaac |
Chapter 6 
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??? • The Lamb • Mega Satan |
Greed Mode
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Ultra Greed Ultra Greedier
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The Void
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Delirium
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| Chapters 1-4 | The Fallen • The Headless Horseman |
 The Binding of Isaac: Rebirth
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