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In your opening post you hint at an interesting idea... gods vs. the outsiders that serve them. Like the story of Lucifer and his rebel angels turning against God (check out Paradise Lost for inspiration). Or like the the Greek Olympian gods overthrowing their predecessors the titans.
Maybe society has been gradually turning away from religion and turning towards technology/arcane magic. It reaches a point that the benevolent gods and the evil gods agree that the sentient races of the world are irredeemably flawed. Good and evil deities alike form a pact to cleanse the world of all life and begin anew. Their servants, the various outsiders, deal more directly with the peoples of the world and more invested in it. The good outsiders want to see the various humanoids who have remained faithful rewarded, and to keep up their good works. The evil outsiders have invested too much of their power in building up cults of humanoid followers and forming pacts with humanoid spell-casters. If the gods can so quickly turn on the mortals, who's to say the outsiders won't be next. Reluctantly the greatest of the good outsiders and the evil outsiders band together to declare war on the gods and to save mankind/elfkind/orckind/etc.
PCs would of course be caught in the middle, probably siding with the outsiders, and the outsiders' ultimate goal might be to ascend to godhood and replace the deities they destroy.