Something beneath the world is waking. For twenty years the dead have walked the earth. Kingdoms have collapsed beneath endless waves of corpses while the last survivors cling desperately to isolated fortresses hidden among ruined lands and frozen mountains. When the ancient bell beneath Black Hollow Fortress begins ringing once more, hardened survivor Silas Vale discovers the undead plague was never truly a disease at all. It is a calling. As entire populations descend willingly into darkness beneath the mountains, Silas uncovers the horrifying truth about the wardens buried below the earth, colossal chained giants bound to ancient bells older than civilization itself. Beyond them waits the First Door, a forgotten prison hidden beneath the frozen north where something vast and terrible has slept since before mankind first walked the world. Now the bells are awakening across the world again. The dead are gathering. And the Door is beginning to open.