Sourcery by Terry Pratchett

I love these books! They are funny fantasy/adventure and marvelous social commentary. Pratchett, as noted by The Times (London) is the Jonathan Swift of our day. This isn't the best of the lot, but that's like saying it isn't the brightest diamond in the pile.

A child is born and is invested with great powers. Eight years later, he arrives at Unseen University where all the wizards are happy to follow him for the greater glory of their kind. (The general population tend to ignore them.)

Almost all are happy. Rincewind, who failed most of his wizardly studies, and the Librarian, who, by mistake, was transformed into an Orangutan and prefers to remain one, are not happy. Together with Conina, daughter of Cohen the Barbarian, Nijel, a hero-in-training, and The Luggage, they set out to save the world from the Apocolypse of the Horseman and Three Pedestrians.