Dawn of Cobalt Shadows by Emma Hamm

A tamed dragon may be loyal, but it will forever be free.

Loose from her cage, Sigrid of Wildewyn returns to her homeland with a heavy heart. An army of Beastkin await her orders in a new kingdom made out of animals and forgotten rules. When she begins to lose faith in herself, she embarks on a journey to find her history and that of all the Beastkin.

Far in the desert, Nadir tightens his control over his kingdom. For a time, he’s the Sultan they’ve all waited for. Until an assassin arrives in his palace declaring a legendary warrior has summoned him. A warrior who claims to be his mother.
Both struggle to discover their own history, while remaining tied to each other regardless of distance. But a war brews between the kingdoms. Sigrid and Nadir must once again choose between each other, or their people. Only this time, they aren’t certain what they’ll choose.