From the back of the book:
Stormbringer is a roleplaying game based on the novels of Michael Moorcock, whose tales about Elric and other incarnations of the Eternal Champion are now classics of fantasy available everywhere in the English-speaking world.
In this game, heroes discover secrets about the world of the Young Kingdoms, the nature of the universe, the Gods of Law and Chaos, and what their prophecies portend. You and your friends portray ordinary people from the Young Kingdoms who seek adventure, riches, power, and understanding. You face the same sorts of situations and dangers that Elric, Moonglum, Dorian Hawkmoon, and Corum encountered, but this time you must win those legendary victories.