In the frost-locked heights of Northern Bahysaris, Prince Byuga is a man becoming a ghost within his own skin. Stripped of his birthright and surrendering his senses to a creeping, inexplicable blight, he is exiled to the gargantuan monolith of Gaigen—the Black Tower—to wither away in the silent service of duty. But beneath the shadow of the great spire, the ancient order of the world is fracturing.