So I don’t have a whole lot to go on with this theory, but I just wanted to hear your thoughts. So basically here’s my basis for this theory. We know nezarec is seemingly not connected to the light or dark. And it seems that the void is the only other power that can rival these two. We know the psions have some mastery over the void, seemingly nezarec is proficient in it as that’s what the perk of the helmet centers around. And if you look at the shape of the helmet it is shockingly similar to the psions. We don’t know much about the psions past, so could it be possible that nezarec is an extremely old and powerful psion?
Nezarec is currently a pre-Golden Age myth that speaks of a god that brings pain and agony.
If you scroll down a little from the top, you can see Sherlock Holmes and my post about how the myth may relate to the Lovecraft Mythos.