I think "celestial" aether is the source of the aether, as opposed to what typing it is? It's sort of a variation on the Conjury and White/Black Magic method of taking aether from the planet rather than utilizing your own aetheric energies. Just, rather than pull the aether from Hydaelyn, you're drawing energy from the constellations above. Or something along that line, at least.
I say that because I'm very vaguely remembering something that might've made mention that the stars serve as more of a focus but you're still using your personal aether or something despite all the astrology talk. Could be totally misremembering, though. Wouldn't be the first time.
I say that because I'm very vaguely remembering something that might've made mention that the stars serve as more of a focus but you're still using your personal aether or something despite all the astrology talk. Could be totally misremembering, though. Wouldn't be the first time.