Priestess of the White -- Trudi Canavan

When Auraya was chosen to become a priestess, she could never have believed that a mere ten years later she would be one of the White, the gods' most powerful servants.

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 .