Pawn of Prophecy: Belgariad 1

Myths tell of the ancient wars of Gods and men, and a powerful object - the Orb - that ended the bloodshed. As long as it was held by the line of Riva, it would assure the peace.

But a dark force has stolen the Orb, and the prophecies tell of war.

Young farm boy Garion knows nothing of myth or fate. But then the mysterious Old Storyteller visits his aunt, and they embark on a sudden journey. Pursued by evil forces, with only a small band of companions they can trust, Garion begins to doubt all he thought he knew...

Book by author David Eddings.