Pyromancer (Mancer, book 1) by Don Callander. The Official Raymond E. Feist Website. Myth Adventures Home. With A Single Spell. , updated January 7, 2012.
With A Single Spell was the second novel in the Ethshar series -- though it's not second in internal chronology. It's the story of an apprentice wizard whose master has died after teaching him only a single simple spell. He sets out to seek his fortune equipped with nothing but the means of magically lighting fires, and stumbles into far more than he ever expected. With A Single Spell A Legend of Ethshar.