Ethereal Plane

The Ethereal Plane is a transitive plane that coexists with the Prime. Ethereal creatures can see into the Prime, but not the other way around. It is mainly accessed by spells such as etherealness and ethereal jaunt.

Certain creatures primarily dwell on the Ethereal Plane. Examples of these include ghosts and ethereal marauders. Others can become ethereal virtually at will, such as thought slayers and phase spiders.