Dark Lord by Ed Greenwood
"Dark Lord" is the first of three novels in "The Falconfar Saga". Rod Everlar is a writer who has created a fantasy world called Falconfar, into which he is drawn. There, he discovers that three dark wizards dominate the land. Now he must learn to seize control of Falconfar and find a way of defeating the corruption within. "Dark Lord" displays all the hallmarks of Ed's reputation for creating a richly realised fantasy setting, and characters that shine.