Priestess Of The White: Book 1 of the Age of the Five by Trudi Canavan
When Auraya was chosen to become a priestess, it meant leaving behind her village, her family and the friendship she had formed with Leiard, the local Dreamweaver. Masters of herb lore and healing, Dreamweavers were despised for their heathen beliefs, and Auraya knew that she must hide her respect for the godless healers if she was to succeed in her new role. Now, ten years later she is a Priestess of the White, gifted with exceptional powers by the gods. Auraya still needs time to fully adapt to her new abilities but time is the one thing she does not have. Mysterious black-clad sorcerers plague the land, raising fears that these powerful strangers may even be stronger than the gods' chosen five. As hostile forces gather momentum, the White work to seal alliances wherever they can. If the land is to be drawn back from the brink of war, Auraya will need to master her Gifts and call upon all of the courage and wisdom at her disposal. For if the tide is not turned quickly, Auraya fears she may be remembered as the last Priestess of the White...