The Bone Witch,

Tea's gift for death magic means that she is a bone witch, a title that makes her feared and ostracized by her community, but when an older bone witch trains her to become an asha--one who can wield elemental magic--Tea will have to overcome her obstacles and make a powerful choice in the face of danger as dark forces approach.

In The Bone Witch, Tea mastered resurrection―now she's after revenge... No one knows death like Tea. A bone witch who can resurrect the dead, she has the power to take life...and return it. And she is done with her self-imposed exile. Her heart is set on vengeance, and she now possesses all she needs to command the mighty daeva. With the help of these terrifying beasts, she can finally enact revenge against the royals who wronged her―and took the life of her one true love. But there are those who plot against her, those who would use Tea's dark power for their own nefarious ends. Because you can't kill someone who can never die... War is brewing among the kingdoms, and when dark magic is at play, no one is safe.

In the Eight Kingdoms, none have greater strength or influence than the asha, who hold elemental magic. But only a bone witch has the power to raise the dead. Tea has used this dark magic to breathe life into those she has loved and lost...and those who would join her army against the deceitful royals. But Tea's quest to conjure a shadowglass, to achieve immortality for the one person she loves most in the world, threatens to consume her.