Necropolis is a Floor in The Binding of Isaac: Rebirth. It is the third stage of the game and it houses the Mom Boss fight. It is also the alternate version of The Depths and is unlocked by killing all of The Depths Bosses.

Unique Features

  • Skulls are found in Necropolis. They will either contain nothing, a Host, a Card/Rune, a Black Heart, a Ghost Baby, or a Dry Baby.
  • Necropolis II will always have Mom as the Boss in the Boss Room. The Boss Room cannot be exited through a door once entered.
    • If the player defeats Mom in under 20 minutes, they are allowed to exit this Room into Boss Rush.


  • The theme for The Depths is When the Blood Dries.
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