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Interesting thought.
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Huh. Well, that might work considering the essence of light being mixed with the essence of something like the Abyss might have rather...paradoxical results (hence his abilities).
I feel like he'd need a bit of relation with life, corruption, and the void to be what he is.
Almost like The Goddess of life's hated son, or something.
I say this because The Eldritch God is capable of creating, drawing forth, and altering himself into the likeness of Eldritch forces, abominations, or (at his strongest) manifesting whole locations of such nature.
Since the Eldritch beings are a sort of twisted form of life, I'd say chaos and the void are involved. Since htey are life, life would be involved. At least that's my reasoning...idk.
Further Ideas?
Maybe the God of life decided to get kinky with the Goddess of darkness?