Ethereal Plane

The Ethereal Plane consists of two parts: the Border Ethereal which connects to the Inner Planes, and the Deep Ethereal plane which acts as the incubator to potential demiplanes. From a Border Ethereal plane a traveler can see a misty version of the plane from which they are traveling; however, each plane is only connected to its own Border Ethereal, which means inter-planar travel necessitates entering the Deep Ethereal and then exiting into the destination plane's own Border Ethereal plane. Many demiplanes, such as that which houses the Ravenloft setting, can be found in the Deep Ethereal plane; most demiplanes are born here, and many fade back into nothingness here.

The Ethereal Plane exists on a microscopic scale. To enter the Ethereal Plane, one's body and belongings must become dematerialized (travelling in the Ethereal dimension from matter to energy), via such magical items as Oil of Etherealness, or spells like Plane Shift, or Vanish.