Astral Plane

The Astral Plane is the name given to a plane of existence that coexists with the physical plane. However, time does not move forward in this plane.

Certain demons reside in the Astral Plane, such as Abraxas, while others are banished there as punishment or when they cannot be vanquished otherwise. A notable example is the Noxon Demons.

Season 5
In "Paradox of a Lifetime", a demon of the astral plane named Paradoxas seeks to create chaos by destroying both the Destined Ones and their alternate dimension counterparts, the Chosen Ones. He opens two portals to send two from each universe into the other, all while operating from the cover of the astral plane. To destroy Paradoxas, the three Twice Blessed Children travel to the astral plane and use their combined power to destroy the demon. This undos the spell and allows everyone to return to their rightful dimensions.