The Farthest Shore — Ursula K. Le Guin

Arren, the Prince of Enlad.. . Ged, the Archmage of Roke.. .

The young prince brought harsh news. There was no longer true magic in Enlad--the mages had forgotten their spells. The springs of wizardry were running dry ... With Arren, Ged set out to meet the unknown dangers, to confront his own past, and to test the ancient prophecies ...Ged took with him on his journey all the hopes of Earthsea, moving now into doom or into a new age...