Its funny watching Sylvanas fanboys be like PRINCE RENATHAL IMPRISONED DENATHRIUS WITH THE LIGHT AND THAT SUCKS. You've lost the right to complain about the quality of the story for simping for the worst character in the franchise.
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Remornia saves his spirit after the fight which implies that had it not done so, then he would have presumably permanently died.
Fair enough. I don't mind the ending that much sense there it is the type of irony I live for. I honestly hope he doesn't come back in this expansion or at least anytime soon.