Is there a reason there is no Existence set? Also Astral would have the same question...
Having the ring drop from the Essence boss make me also think that all the sets could be the same. You get all but one drop from the creeps in the area, and the boss drops the last piece for the set!
A new set was requested awhile back: http://pomfoc.ucoz.com/forum/24-543-1 But right now, he's putting in something that will change the game When faced with two choices just simply flip a coin. Not because it settles the question for you, but because that one second it is in the air you suddenly know what you are hoping for.