The Medoran Chronicles, tome 4 : Graevale

Now that Aven Dalmarta sits upon the throne of Meya, Alex is in a race against the clock to save the mortals of Medora from the Rebel Prince's wrath. Guided by a haunting and unspeakable vision of the future, Alex and her friends must warn the mortal races. But making new allies out of old enemies proves difficult. Under the guidance of a mysterious mentor, Alex learns to strengthen her gift to fight the challenges she now faces. But in a world where nothing is certain, Alex is sure of only one thing: Aven is coming.