When Deckard Cain returns to the ruins of Tristram’s Cathedral seeking clues to new stirrings of evil, a comet from the heavens strikes the very ground where Diablo once entered the world.The comet carries a dark omen in its fiery being and it calls the heroes of Sanctuary to defend the mortal world against the rising powers of the Burning Hells – and even the failing luminaries of the High Heavens itself.