The Battlemage (Summoner, Bk. 3)

Fletcher and his classmates from Vocans Academy - including the elf Sylva and the dwarf Othello - travel through the ether, where they must pursue a mortally dangerous quest to rebuild their world and broker peace. As he leads a small army of soldiers, Fletcher will face his biggest challenge yet: his nemesis, the albino orc Khan, who seeks to destroy everything Fletcher loves.