"I think the issue/confusion here may lie in thinking of Yugol as an antagonist whereas it is more of a constant of the universe.
It cannot be reasoned with, it cannot be killed, it cannot be undone. It is the essence of nothingness.
In contrast, Ch’thon is a primordial elder god, the progenitor betrayed by his children, torn asunder and cast into the abyss. Incapable of ever truly dying, he yearns for the return of what was taken. His return to the mortal plane would herald a reckoning never before seen."
"The void is a hellscape, a place of misery and pain, the antithesis of life. It is where the dying god was cast out when he was torn asunder, never quite capable of fully dying.
Yugol on the other hand is nothingness, the antithesis of existence itself. It has no goal, it simply is; and where it spreads, nothing remains."