The Pellinor saga, book 1: The GiftAlison Croggon2005

When 16-year-old Maerad meets a man named Cadvan, she is catapulted from her life as a slave to an epic destiny. Cadvan is a Bard, one of the magically gifted Starpeople, and he begins to teach her about her own gifts and abilities. He believes her to be the prophesied One who will oppose the Nameless, the dark power working toward the destruction of the Bards and the Balance of the world. As Maerad and Cadvan travel, they join forces with Hem, a mysterious orphan, and learn that the Nameless's influence reaches far into the world of the Bards.