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Start by apologising to the other players for letting things get to this point.
You favored the one player, granted him ridiculous abilities, abetted him shredding the social contract governing the game (we can only presume the other players weren't expecting things to turn PC vs PC) and affecting the fun of the other players. And you only want to do something about it now when it affects your specific plot lines?
Rovagug's followers want to literally end the world. Have them betray the betrayer or some such. Your at the point where you either kill off the single PC or convert him to NPC status.
Unless the whole game was PC vs PC from the start. Although in some ways thats even worse on your part for boosting one PC over the others.
Either way the real problem here seems to be you.