<Snipped quote by Caldizar>
Nemid's goal, reasoning and such is that he comes from Brinkspace, which is the fringe area between Existence and Outside, and his people have fallen under some sort of undisclosed level of tyrannical control by an unknown force. He left to take power from other realities, and came back to Existence after doing so to try and absorb it and gain the strength needed to fight back against his people's oppressors.
TL;DR: He's trying to absorb Existence into this crystal-esque object in his head for power.
I see. Well depending on the level of time fuckery allowed, I might just have a character who's willing to help him in that goal, since said character sees Existence's absorption as no real problem since he can just time travel into the past repeatedly and live out his life in the years proceeding the event.
Assuming it isn't retroactively absorbed that is.