Okko: The Cycle of Earth #4

It is the Winter of 1109 in the official calendar of the Pajan Empire. Okko and his companions have reached the mysterious Eighth Monastery on the Roof of the World. They enter the Forbidden Library seeking to discover the truth behind events in the mountains where they discover the dark secrets of their enemies: an army of the dead from the bowels of the earth preparing to invade the Empire!