My third and final nomination is a fun book, writen by the master Terry Brooks.
Magic Kingdom for Sale -- Sold
After Ben Holiday purchased Landover, he discovered the magic kingdom had some problems. The Barons refused to recognize a king and the peasants were without hope. To make matters worse, Ben learned that he had to duel to the death with the Iron Mask, the terrible lord of the demons--a duel which no human could hope to win....