Castle of Wizardry by David Eddings (The Belgariad #4)

As the prophecy begins to unfold, Garion must face the truth about his destiny—and decide whether he’s ready to become the sorcerer the world needs. With the Orb reclaimed, the journey leads to Riva, where ancient secrets and new responsibilities threaten to change everything. Castle of Wizardry is the fourth volume in David Eddings’ beloved Belgariad series, full of magic, wit, and classic high fantasy adventure.

Paperback, 1984

Goodreads: 4.18