Trial of Three by Alex Lidell

Four cords of power. Three trials. Two soul-crushing secrets.

For Lera, training has never been so hard. With the males’ power roaring in her veins and River’s cold demand that she master the magic before the third trial, something has to give. Worse still, River is keeping something from her. Something about his past and Lunos’s future.
For River and Coal, the past must stay buried. Though one male’s nightmare sits on a throne and the other’s hides in his soul, they are equally unprepared for Lera’s startling determination to undress the truth.

But when Mors’s Emperor Jawrar makes a play for Lunos, neither Lera’s fledgling magic nor the males’ old wounds can remain untouched—not if their world is to survive.