Myth Conceptions — Robert Asprin

A demon who had lost his powers, Aahz still managed to keep his apprentice, Skeeve, out of most kinds of trouble. Then Skeeve was summoned to the court of Rodrick the Fifth of Possiltum to audition for the position of Court Magician. Unfortunately for everyone, he got the job.

How was Aahz going to help Skeeve defend a kingdom against the mightiest invading army in the world? With his pet dragon Gleep and bewitching green-haired Tanda standing by, Skeeve waited for Aahz to come up with a solution. The problem was, if they won they would be executed--and if they lost they would be killed. What kind of magik could beat those odds?