Also known as the Astral Sea, the Astral Plane is a great cosmic plane of lightness and portals. Gravity and time do not function typically in the Astral Plane, the latter of which is used to great extent by creatures intricately tied to the flow of time like Chronepsis. Because this "sea" is the linking fiber between all of the planes, some consider it to be the biggest plane of all, while others do not consider it to be a plane in the classical sense.
As every day of the Astral plane passed, the entire span of the Quelmar Universe passes, and with each new rise of the astral sun (actually a vast, distant portal to another universe) the time span of Quelmar is restarted. In a way, a creature who dwells in the Astral Plane is immortal, as they have lived at every instance of Quelmar's existence.