Inferna

Inferna, also known as Hell or Sheol, is the planet on which the demons are.

Description
Inferna is the planet that is home to the Demons. It is known that long ago the Fae defeated the Demons and sealed them away on this planet. The only way out of the planet is the Demon Portal, which was created by the Fae for unknown reasons; mortal demons are capable of using this portal to exit Inferna easily.

Geography
Not much is known about what it is like in Inferna, but according to Hebïra, a Mortal Demon Khi encountered in The Wildlandes, there is a place in Inferna called Erebos City, near a place called the Tempestuous Desert, and supposedly the other end of the Demon Portal is near these areas.

Trivia

 * Inferna is Latin for hells
 * Sheol is a Hebrew word referring to the world of the dead
 * Despite being identified with Hell, Inferna is only the home of demons; souls actually get taken to a place known as either the Luminous Netherworld or Mortis. However, it is possible that souls are sent to Inferna in the same manner as they would be sent to Hell in religions with that form of afterlife system