>Bunch of pissed off angry warmonger ghosts get together in the Shadowlands and plot a big prison break
>They escape into Azeroth because something something broken sky-ceiling
>They possess various faction leaders across both horde and alliance and start up the machinery of war
>Most faction soldiers know better and think their leaders are acting a bit weird but are nonetheless bound by their oaths and loyalties
>Only the player character and a few companions know the truth and have to fix things while also carefully treading the dangerous political currents which have arisen
>World of Warcraft: Warmongers

Bam. Faction conflict with familiar faces and nobody truly acting out of character and no avenue for crying on the forums because ultimately both teams are being pulled into the fight against their will and it's not really anyone's fault except the evil ghost bosses we need to defeat. This shit is so easy in a setting full of magic and paranormal crap floating around everywhere.