These are badass, but I'd like to throw out a little more challenge into the mix to see if we can do better:
Can we do a two syllable or fewer word? All other runes adhere to this rule, and it makes them nice and snappy to say. I really liked the "Ether" suggestion, but it overlaps a bit much with Revenant Ether.
I think cosmic soul runes are a tough one. What is the soul of the cosmos? It's almost begging a question of the lore. Maybe we need to get Ed involved...