what's the name & author of this fantasy book??

Question

the main character was a guy named Bink who lived in a land where ev'one had a macigal talent by a certain age or they were exiled. this happened to bink. while in exile he met a girl who had a curse. @ the start of a month she was pretty but dumb. in the middle she was average looks/smart @ the end of the month she was ugly as sin but smart as a whip. in end of the book bink finds out he does have magic. his magiacl talent was that no magic could be used on him. also ev'thing in the land was litteral. a nightmare was a mare the came out at night.A joshua tree was a tree named joshua.

Answer 1

A Spell for Chameleon by Anthony Piers. It is book 1 of the Magic of Xanth series.

Answer 2

It's the first Xanth novel by Piers Anthony. The title is "A Spell for Chameleon."