Belgarion Series / Belgarath the Sorcerer / David and Leigh Eddings

When the world was young and the gods still walked among their mortal children, a headstrong orphan boy set out to explore the world. Thus began the extraordinary adventures that moulded this youthful vagabond into a man, and the man into the finely honed instrument of prophecy known throughout the world as Belgarath the Wizard.
Then came the dark day when the dark god Torak split the world, and the god Aldur and his disciples began their monumental work to set destiny right. Foremost among them was Belgarath. His tireless devotion was to cost him what was dearest to him – even if his faithful service would endure centuries of loss, struggle and ultimate triumph.