Death's Mistress (Paperback) by Terry Goodkind

Sister of the Light Sister of the Dark. The Slave Queen Death's Mistress. Nicci has gone by many names and faced many challenges. But that's in the past. Now on the far horizons of a world forged anew she must heed the witch woman's words: 'and the sorceress must save the world'. As Nicci journies into uncharted lands she'll face her greatest test yet. She's saved the world before but she's never had to do it on her own...