The Bone Witch, book 3: The ShadowglassRin Chupeco2019

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.

Tea's heartsglass only grows darker with each new betrayal. Her work with the monstrous azi, her thirst for retribution, her desire to unmask the Faceless—they all feed the darkrot that is gradually consuming her heartsglass. She is haunted by blackouts and strange visions, and when she wakes with blood on her hands, Tea must answer to a power greater than the elder asha or even her conscience. Tea's life—and the fate of the kingdoms—hangs in the balance.