Iona was a gifted wizard. In many ways, she remains so. As a young woman, she went on many great adventures and had a reputation for using her magic in a cavalier fashion.
Then the careless use of magic caused irreparable harm to a companion. Even though the victim forgave her, the experience and guilt caused her to retreat into a scholarly shell.
She is now responsible for the research laboratories at Selixus' Casters-Tower. She is has a strict set of guidelines about using the facilities.