The Black Raven. Book Two of the Dragon Mage

For the devoted followers of the dazzling Deverry and Westlands cycle, Katharine Kerr continues the magical epic saga she began in The Red Wyvern. In her latest tale, the scene shifts seamlessly between the shattered land of the Rhiddaer and the historic end of the Civil Wars, when Lilli, newly apprenticed to dweomer, fought with her untried powers to save her beloved Prince Maryn from evil. Centuries later, in the city of Cerr Cawnen, the old evil awakens yet again when the sorceress Raena schemes to destroy Rhodry Maelwaedd, her bitter enemy during life after life.
But her malice will draw the intervention of astral powers--and unleash the ravaging rage of Rhodry's guardian dragon. Only another untried dweomer can buy safety for the city and the berserker himself--and only at a most fearsome price....