Really great story so far ! I'm pretty sure the titans aren't gonna be too happy with him when they arrive considering he is now more old god than elemental. (I'm not too sure about their motivations else than protecting azeroth though so maybe they won't mind). Maybe they will punish him in some way so that he won't be so strong because I feel like you're kind of trapping yourself by making your character this op compared to everybody else. Aside from this your story is really reminding me of "Way of the Devil", one of my favourite chinese cultivation novel where the protagonist's physical appearance changes according to his powers. He starts by losing his hair and becoming very muscular before slowly becoming more monster-like along every power up. Happy new year !

Hypocrite much ?