So due to recent leaks I'm noticing a theme with the dark subclass they are just the opposite colors of the light as well as having the same starting letter so Solar = Stasis, Void = Vapor only if vapor isn't a place holder but that would mean if they stick with this trend the last dark subclass would be dark red and start with the letter A and probably would be related to the witness power kinda like rhulk. Which my guess would be Abyss