Vathek

When you have all you could ever want, what's left to wish for?Vathek, the majestic and fierce ninth caliph of the Abassides, has the world at his feet, with pleasure palaces constructed solely to satisfy his every possible appetite. Nothing is beyond his grasp, until a hideous stranger sells him glowing swords with letters on them that cannot be translated even by experts--because the letters are ever changing as if by magicObsessed with obtaining the stranger's knowledge, Vathek undertakes a massive search of his kingdom. Both his anger and his intellect are legendary; possessed of an intense thirst for knowledge, he often invites scholars to converse with him, but imprisons those who cannot be persuaded via logic or bribes to his point of view.

His journey becomes increasingly horrific as he ventures into the underworld, meeting demons and witches.