Whom the Gods Love by M.M. Perry

Cass is a seasoned warrior with many battles under her belt. She’s tamed griffins, toppled trolls and conquered mountains. But when a god is in the mix, no outcome is certain.

Her quest is simple – help a king find a cure for his ailing queen. The only problem is the cure is in the hands of a mercurial god, one who has a habit of killing humans.