The Belgariad: Enchanter's End Game - David Eddings

Come, Belsarion, Chil of Light. I await thee the Cityof Night.

Garion has been crowned as Overlord of the West. the rightful descendant of Riva Iron-grip and the bearer of the Orb of Aldur.  But the Prophecy is not yet fulfilled. For across the seas. the evil God Torak is waking once more. While hordes of Murgos and Grolims march under his banner to destroy the free peoples of the Alorn kingdoms. Garion nust ride towards a meeting that has been prophesied since the beginning of time.

In the decaying ruins of the City of Endless Night, he must face the Dragon-God in a dread duel, the outcome of which will determine the destiny of the entire world.

ENCHANTERS' END GAME is the final, triumphant book in a magnificent fantasy epic set against a history of seven thousand years of struggles between Gods and Kings and men.