Purgatory

Purgatory is the name given to a plane located somewhere between earth and the Underworld. It serves as a prison for banished demons and other evil beings.

Description
A purgatory is a deep pit which resembles the conduit of a volcano. Pieces of rock, large enough for an adult person to stand or sit on, are scattered throughout this place. However, movement is limited and one wrong move may cause a demon to fall from his rock and into the pool of magma at the bottom.