Away from the world and its petty wars, there is a dimension of pure, malevolent magic: The Realm of Chaos. It is a dreadful place, incomprehensible to the mortal mind. It whispers promises of power, but to see them, you must be lured by it. To surrender your soul to it. To become it.

The four Ruinous Powers rule this place, always striving to break free from their bonds and flood the world with a wave of demonic corruption. Nurgle, the god of plague, Slaanesh, the lord of excess, Tzeentch, the changer of ways, and Khorne, the god of blood and slaughter.

On the borders between worlds, two mighty realms stand as guardians, the stern warriors of Kislev and the vast empire of Grand Cathay. But each is plagued by its own trials, and now both have reason to cross the threshold and send their armies into the Realm of Chaos.