From the back cover: This book includes: - A comprehensive examination of the origins of the Mysterium, stretching back into the misty legends of Atlantis. - Details of how the Mysterium approaches its Supernal mandate to gather and preserve all knowledge, as well as the secrets of the Atlantean Mystery tradition at the core of the order. - A variety of new spells, Artifacts, imbued items and Legacies to use in your Mage: The Awakening chronicle.