The Medoran Chronicles, tome 5 : Vardaesia

When Day and Night combine and fight against one Enemy, then Dark and Light shall meet mid-strike and set the Captives free. In the wake of loss and devastation, Alex must cast aside her grief to seek aid from those who banished the Meyarins long ago. But the proud Tia Aurans care little for the woes of mortals and demand that Alex - and her friends - undergo the Gates of Testing to prove their world is worth saving. With an ancient prophecy looming, Alex must confront the secrets of her past if she is to survive long enough to see the future. For if she returns to Medora without the Tia Aurans by her side, all hope will be lost. In this explosive conclusion to The Medoran Chronicles, the fate of Medora hangs in the balance as Alex readies herself to face Aven one final time. Who will survive, and who will fall? If, however, darkness wins, there is no strategy to keep from all that will be lost, and so will always be.