The queen of blood
(Book)

In Renthia, everything has a spirit: the willow tree with leaves that kiss the pond, the stream that feeds the river. But the spirits of the land want to rid it of all humans. The queen is the only woman who stands between the spirits and the end of humankind, and no matter how strong or good the queen is, the threat of danger always looms. And so, Daleina is one of the young women chosen and trained as heirs to the throne. She joins forces with Ven, a disgraced champion who has nevertheless spent his exile secretly fighting against the growing number of spirit attacks. The partners embark on a quest to find the source of the spirits' restlessness, which will test their courage and trust, and force them to stand against both enemies and friends to save their land. -- adapted from author's website.