A Court of Bone and Sorrow

Dea is forgettable.

Lost in the vastness of her elder brother's shadow, Dea lurks at the fringe of a great family, better suited to hiding a smile and presenting an aloof, uncaring front to any outside their territory. Not daemati. Not shadowsinger. Hardly Illyrian. Not special, and destined to lurk in shadows that would not envelope her, cursed to be powerless, while her brother holds it all. But Rhysand is not their father, and Dea is not their mother-half of them High Fae, half of them Illyrian, forever trapped between two peoples, two cultures, and two parents whose rage makes the mountains tremble.

Until war steals her brother and father and all she holds dear away, far off to battlefields they might never return from. And Dea is running from something only known in the bones below the earth, where her brother has forbidden her from going. But as great armies clash and the noose grows tighter, Dea needs answers. Before her brother is lost to the shadows he loves so dearly.
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Also available on AO3.