Binding of Isaac: Rebirth Wiki

It Lives is a boss that can appear on the second floor of Chapter 4 (Womb Womb, Utero Utero, Added in Afterbirth Scarred Womb Scarred Womb). After being unlocked, it permanently replaces Mom's Heart Mom's Heart.


It Lives behaves identically to Mom's Heart, with the exceptions of different spawns for its phases:


Unlockable Achievements[]


  • Just like Mom Mom and Mom's Heart, using The Bible The Bible or Added in RepentanceXV - The Devil? XV - The Devil? against It Lives will kill it instantly.
  • Added in Afterbirth Isaac can encounter It Lives in the nightmare boss wave of chapter 4 in Greed/Greedier mode even if it has not been unlocked.


  • It Lives! appeared in the original The Binding of Isaac.
  • The music that plays during this fight is titled Ventricide.[1] Ventricide is a portmanteau 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 shares this theme with Mom's Heart.
  • It Lives, according to the developers, takes the shape of what Isaac looked like as a fetus.
  • According to Edmund McMillen, It Lives supposedly represents Isaac wishing that he were never born.
  • It Lives makes the same sounds as Mom's Heart.
    • Like Mom's Heart, if Isaac takes damage from It Lives' Brimstone Brimstone attack, Mom's laugh can be heard.
  • Despite being a major boss, It Lives isn't linked to any Ending, instead, it opens up entrances to both Sheol Sheol and the Cathedral Cathedral, as well as Added in Afterbirth ??? ??? if beaten in under 30 minutes.
  • The unlock note for It Lives states "Your futures past awaits.", referencing Time Fcuk, another game by Edmund Mcmillen.
  • Removed in Repentance During the versus screen, It Lives' enemy/boss-spawning sound can be heard. It Lives is one of Removed in Repentanceseven/Added in Repentancefive bosses that can be heard during the versus screen, the other Removed in Repentancesix/Added in Repentancefour being Added in Afterbirth The Stain The Stain, Added in Afterbirth The Forsaken The Forsaken, Added in Afterbirth † Big Horn Big Horn, Mom, Removed in Repentance Mom's Heart and Added in Repentance Mother Mother.


Bug Bug! Removed in Afterbirth † 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.