This is the plane where most of the game takes place. This surrounds the Prime Plane and is either the place where psychic powers manifest, or it is a lower realm of the astral plane.
Nobody is sure which is true.
One thing is known by some scholars, it is here that psychic powers work through this plane. Access between the ethereal and Prime planes is easy for psychics and trivial for magicians. These are planes that exist within the Ethereal and it is thought that they were created by powerful beings called elemental kings. The individual kingdoms now constitute worlds within these planes, and pure dilute forms of the element form the spaces between the worlds. This is where the consciousness goes when someone has a dream.