War Hour by Lauren Loscig

When powers are earned and not born, who shall wield them?

Lysta lives in constant fear of Trialing, a deadly test that bestows an ability upon its victors, but only after pushing their mental and physical limits. Forced to Trial against her will, Lysta becomes a weapon others plan to use against the Untrialed, until an unexpected intruder from another Court presents her with an opportunity to stop it. But can she trust the plans of a man who seems to play the lines between enemy and ally?
Only through treason can Lysta save the people she once struggled beside. With the fate of her Court and the lives of the Untrialed at stake, the burden will fall on Lysta to convince the other Courts to intervene. Not to mention, the Crowns seem to fear the frustrating albeit handsome man who rescued her more than the one she testifies against. Lysta must find her own strength in a world of powers, battles, and court politics while navigating tumultuous relationships and hidden enemies.

Will Lysta save her Court or be ended by it?