The Discworld's eighth son of an eighth son of an eighth son is born - a sourceror, a wizard so powerful he could reshape reality itself. Young Coin arrives at Unseen University and promptly takes over, leading the wizards on a magical arms race that threatens to tear the world apart. Rincewind, armed only with a sentient piece of luggage and a burning desire to be somewhere else, is the Disc's unlikely last hope. A book about what happens when unlimited power meets unlimited irresponsibility.