From the publisher's website:
Gifted with power by the Celestial Incarna Luna, the Lunar Exalted were once the mates of the Solar Exalted and trusted Stewards of the Old Realm. Then, after the Lawgivers went mad with power and their Dragon-Blooded troops rose up to slay them, the Lunars retreated to the edges of Creation, biding their time and massing their forces to one day bring down the hated Realm. With the Solars returning en masse, have the Lunars waited too long to bring down the old order and replace it, or does the return of their ancient mates signal that the time is finally at hand for vengeance?
A character sourcebook for Exalted featuring:
* Details of the Creation-spanning Silver Pact, its goals and its factions
* Everything players and Storytellers need to generate Lunar Exalted characters, including their Charms and shapeshifting Knacks
* Rules for the chimerae, mad Lunars whose minds and bodies have been twisted by the Wyld