The Ethereal plane existed adjacent to the Material Plane and was believed to connected it to the other planes of existence. The Ethereal touched the material plane at all points and nearly mirrored it in a sense. It is widely believed to be a translucent plane of immaterial essence which is said to be the home of all manner of ghosts and celestial spirits. Roaming the borderless plane ceaselessly, those which resided within were often distant and unfamiliar beings to those which resided in the material plane. "I'm Ethereal though..."