Necropolis

Necropolis is the alternative chapter of. It is a dark environment infested with insects. Unlike The Depths, Necropolis must be unlocked for it to appear.

Necropolis is unlocked by defeating every boss from The Depths at least once.

The boss of Necropolis II is always Mom.

Monsters

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Final Boss
Mom will always appear in the second floor of this chapter or in the last boss room if Curse of the Labyrinth is active.

Trivia

 * A necropolis is a large ancient cemetery with elaborate tomb monuments. In Ancient Greek, νεκρόπολις or nekropolis literally means "city of the dead".
 * In the original The Binding of Isaac, Daddy Long Legs, Triachnid, Carrion Queen, and The Wretched could appear as bosses.

Music
The music for Necropolis is titled When Blood Dries.

Binding of Isaac: Rebirth OST