Beg The Night (Mystics of Ashora) by Emily Blackwood

From author Emily Blackwood comes a new dark and twisted romantasy about two powerful mystics and the forces that urge them together—even if they hate each other. Athena is an earthly. She wields no power, and though war rages across the lands, she lives a relatively normal life in isolation until she’s kidnapped by the Ministry and questioned for the magic they’re certain she possesses. As she struggles to grasp her new reality, she’s forced into a dungeon with dozens of mystics. Only to discover she’s the only female. True unleashing of power can only be obtained by the claiming—a mating ritual under the powerful blood moon. But Athena is in luck. The mating must be willing, and she is certainly not willing to come within a foot of those men. Until she meets Sinner. Sinner is a tier three—the only three in the entire dungeon, making him the most dangerous and powerful of the men. He has very little interest in getting along with others and prefers to live his life alone. Read more