Aether

Also known as quintessence. An element proposed by Aristotle as the fifth element in the classical element system. He defined aether as being the non corruptible substance of the heavens. This differs from the theory of light that most people know as aether(luminiferous aether). Aether naturally possesses local motion and is a more celestial substance than the other four classical elements.

Earth, Water, Fire, Air, And Aether. Thus are the elements which construct our world.