Queen of Shadows and Ruin by Nisha J. Tuli

Zarya must become the darkness…

Soaring through the sky to the frozen mountains of Andhera, Zarya knows that only she can save her home from annihilation. Ruthless armies hunt her friends and toxic dark magic spreads through the land, consuming all it touches. To fight back, she and Rabin must find dangerous new allies.
In a palace of black marble, Zarya finally meets her father—the mysterious Raja Abishek. She approaches warily. For years she was told to fear this man, that he seeks to steal her power. But Abishek welcomes her with open arms, with gifts and lavish celebrations.
Rabin is sure the king can help them, turning the tide of war and decay. And when the magic binding Zarya’s heart to Rabin begins to fail, only Abishek can offer a cure. Zarya dreads the thought of placing their lives in his hands… But can she hesitate, when Rabin might be torn from her forever?
As Zarya makes her choice, ancient magic breaks loose, and her world shatters. In a ruined and long forgotten city, her love for Rabin will be tested to its limits. An army of shadows marches against her, destroying all in its path, and everything Zarya loves will be lost, unless she can face the darkness inside her—and release its devastating power.