This realm, separate from Heaven, Hell, and Earth, is a dimension usable only by a select few Greater Demons and Archangels. For most celestial and infernal beings this realm is merely an area they lack the skill to enter. Terrestrial beings, however, have a different problem. This realm connects loosely with the portions of Heaven and Hell that spawn dreams, and so humans with Infernal or Celestial ancestry might enter this realm unknowingly while they are dreaming. Once trapped there is no way out until an Archangel or Greater Demon comes along.

The Heaven gate to this dimension is variable in manifestation, coming out in random spots anywhere in the realm.

The Hell gate to this dimension is set, opening roughly twenty feet above the floor of the Library's entry hall.

The Terrestrial gate to this dimension is variable in manifestation, coming out in random spots anywhere on Earth.