Aether

Aether is the magical energy of the multiverse. It is an ethereal and unseen force, found in different forms throughout the cosmos. Aether accounts for most of the mass in the universe, is highly reactive, and can be manipulated into anything through conjuration. Anti-Aether is also found in the universe, derived from anti-matter. 
Magic in the world of Astra derives itself mainly from energetic astral aether as part of a nearby cluster of star systems, enriched by its own terrestrial aether, and the aether essence of life on the planet. The energy field permeates the world, where its magic is drawn on by the living, and contained by the non-living. 
A known pure form of aether crystallizes into a substance called the Othe, which builds up as an ore in the cores of life-harboring planets. The othe channels out into veins into the planets interior and crust, that are manipulating of space and time itself. The othe serve as spatiotemporal conduits that carry out into the far reaches of space, namely to other planets and star systems. 
Aether is the energy used by the mages in the world of Astra, and manipulated by aethermancers. 
Also: Celestial Aether 
Types of Aether: 
Primordial Aether
Galactic Aether
Nebular Aether
Astral Aether
Terrestrial Aether
Aether Essence
Anti-Aether