From the back cover:
The Muses are the creators of Harmundia. Since the dawn of time, Concordists have paid homage to them with their opuses. But today the Concordists are few in number.
Most mages do not concern themselves with the Magical Arts of Tune, Scansion, Shape, or Vista. Instead they use the sparks of their Dancers to develop powerful spells.
But the Enemy draws near, and neither the Cipher-sorcerer order, nor the Concordists are able to deal with the threat alone. The Arts have been tainted and the order is corrupted!
There is only one hope... It is time for you to rediscover the Arts of Magic.
The Grimoire Volume 1 contains all the knowledge necessary to complete a player's understanding of Ciphered Mages and Concordists, as well as additional information for the Eminence Grise revealing the most powerful secrets of Harmundia, including the Square and the Cipher-sorcerer.
This sourcebook will disclose the techniques of the most potent mages, numerous new spells and opuses, the fundamentals of the devastating practice of Choreography, the methods of artifact creation, and other arcane mysteries reserved exclusively for the most experienced players.
The Grimoire also describes numberous new assets and faults, and includes "Requium for a Dead Mage," a lengthy drama set in Lorgol.