Isto pode ser Poça de Radiância, uma história de Forgotten Realms baseada em, iirc, um jogo de computador antigo. O livro foi publicado pela primeira vez em 1989.
Shal Bal é a aprendiz de um mestre poderoso e gentil que é morto, e ela herda seus pertences, um dos quais é um Anel de Desejos
When Shal Bal of Cormyr's master, Ranthor, receives a message from his old friend and fellow mage, Denlor of Phlan, whose tower is under siege by hundreds of monsters, Ranthor rushes to aid him. Shortly, Shal receives a message from Ranthor via crystal ball, during which he warns 'beware the dragon of bronze'2 and is murdered by an unknown assailant. Shal inherits Ranthor's familiar, a white horse named Cerulean, and Ranthor's various magical items, including a staff of power and a ring of three wishes. However, along the way to the Moonsea, when she wishes she were able to lift a large pack, she is turned into a hulking, seven-foot-tall giant by the ring. In her rage, she wishes she were at Phlan, and is teleported there instantly.