we have the Ambermoon Warbands, for which their Impending Doom is Rampant Chaos, as they are really not hip on central gov't :P and would likely remold the entire world into city-states or the likes if given free reign (they are nomadic Orcs, traveling in caravans that are largely self-governing/independent, albeit connected by courier)
we have the Drakensreich, for which their Impending Doom is Usurpation, for dragons care not for human concepts of who should or shouldn't run the show, believing themselves rightful rulers of the world
and then we have the Purifiers, for which their Impending Doom is Tyranny, of those considered pure over those considered "lesser"