The Everchosen is the supreme champion of Chaos Undivided — the single mortal warrior chosen by all four of the Dark Gods at once to unite their fractious hordes and lead them to the final conquest of the world. Where lesser champions serve a single god and squabble endlessly with the followers of the others, the Everchosen commands the devotion of all, and beneath his banner the tribes of the north march as one.
Such a champion arises only rarely, when the Dark Gods together set their favour upon a mortal who has proven himself in blood beyond all rivals. To claim the title he must survive a gauntlet of trials in the Chaos Wastes and gather the sacred treasures of Chaos, and only then do the heavens acknowledge him. So marked, the Everchosen becomes the herald of the world's ending — the mortal instrument through whom the Ruinous Powers mean to tear down all order and drown creation in Chaos.
History remembers the Everchosen with dread. It was Asavar Kul who led the horde of the Great War Against Chaos that nearly ended the Old World, and in the last days it would be Archaon who gathered the greatest army of darkness the world had ever seen. When an Everchosen rises, the Warriors of Chaos pour south in their countless thousands, and every free realm knows that the gravest of all its trials is at hand.