The Battlemage - Summoner Book three by Taran Matharu.

The epic conclusion to Taran Matharu’s New York Times bestselling epic fantasy Summoner Trilogy, The Battlemage is an action-packed adventure of a young man gifted―or cursed―with an extraordinary and terrifying power…
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.

Duration: 10 hours 21 minutes