Elminster: The Making of a Mage is a 1992 fantasy novel by Ed Greenwood, set in the Forgotten Realms universe. The book chronicles the early life of the wizard Elminster, from his tragic childhood as a shepherd boy to his time as a rebel, thief, and his eventual encounter with the goddess Mystra, which sets him on the path to becoming the powerful mage he is known to be. 
Plot summary
Early life: The story begins with Elminster as a young shepherd boy who dreams of adventure. 
Encounter with magic: His life takes a dramatic turn when he is attacked by a dragon-riding magelord, thrusting him into a world of magic, corruption, and evil sorcerers. 
Path to becoming a mage: The narrative follows his journey as he becomes a rebel fighter, a thief, and eventually has a pivotal encounter with the goddess Mystra. 
Mystra's influence: After a confrontation in a temple of Mystra, the goddess intervenes, saving him and giving him a chance to learn magic, hiding him from those who would use him until he is powerful enough to protect himself.