From the back cover:
The Prophets of the Unconquered Sun
Spiritual pilgrims, the Zenith Caste Solar Exalted are the hands and mouths of the Unconquered Sun. Yet these stalwart heroes are more than mere priests and propagandists. With their crusading hearts and invincible strength, the Zenith Caste Exalted are a mighty force for righteousness in the world. Those who would make the world a place of misery and pain should fear, for the champions of the Sun have come to deliver their comeuppance.
The Judges of a New Golden Age
Caste Book: Zenith is the second Caste Book for Exalted - books detailing the different castes of the Solar Exalted. Within its pages are all the secrets of the Zenith Caste, from its members' immensely persuasive social Charms to their fragmentary memories of the First Age to the shared visions of the Unconquered Sun that unite them. The book also contains new Charms and artifacts to help them carry out their holy mission.