Fading Souls. Ephiron, #1

Nineteen-year-old Itana has spent her life inside a temple devoted to Tera, the goddess of earth. Gifted with the power to see every soul, she has become an instrument in Tera's hands - who lives and who dies depends on her decision. Every twelve years, the Harvest comes and claims thousands of lives. Itana has made a promise to a friend, and to keep it, she must find a cure before time runs out. But the answers lie beyond the temple walls, and the moment she leaves, she discovers the truth: she was never free, only a prisoner, bound by magical runes.
Ahead of her lies Hecate, believed to be a servant of Chaos. Behind her - a goddess who has never learned to let go of what she calls hers. And freedom may cost more blood than Itana can afford.