Glavel was a monk in the Monastery of the Yellow Rose and a member of the Order of the Chisel in the Disciples of St. Sollars the Twice-Martyred. His duty was to act as a brewer and cook for both the monastery and the Guest House. Secretly, he was also a member of the Cult of Howling Hatred.
Glavel was one of the cultists who infiltrated the monastery in 1491 DR. However, he and Olara were discovered by Lana. Despite being left for dead after their meeting, Lana survived and in Mulmaster reported her discovery to the Order of the Gauntlet, the Lords' Alliance, and Zor Garwyl Gos, who hired an adventuring party to investigate. When the adventurers arrived at the monastery, they confronted Glavel.
Glavel at heart was a selfish sociopath. He joined the Howling Hatred only because they encouraged his hobbies. Glavel was a very good liar and would quickly change sides if his life was in danger.