Demiplane

A demiplane is a finite plane that is wholly contained within another plane. A demiplane can be created by beings of the Divine or Infernal Realms within a Primal Plane that they control. Creatures of the Shadow Realms can create demiplanes within the plane of their existence as well. Creating and maintain a plane is very difficult so generally only powerful wizards have the power to create them.

Only creatures native to the plane can create a demiplane within that plane. A human native to the Mortal Plane can never create nor maintain a demiplane within the Fae Lands, likewise a Sidhe in the Mortal Plane.

It is impossible to every create a Demiplane within either the Divine or Infernal realms - a demiplane must be created within an existing plane.

A demiplane can operate within its own rules as long as it does not violate any of the absolute laws of the plane where it exists. Commonly a demiplane is used to create a small space that operates on rules that change, but not violate the native plane's rules. Commonly this involves changes in physical or temporal laws.