Bungus Septrill was the last High Librarian of the Great Library of Sanctaphrax. Although Earth-Studies in Sanctaphrax had ended many years ago, Bungus remained in the city, hiding from the Sky-Scholars and looking after the Great Library. Linius Pallitax formed a close friendship with him in his younger age, often sneaking out of the Fountain House to spend time in the Great Library.
During the events of The Curse of the Gloamglozer, He saved Quint and Maris many times. Bungus Septrill was killed by the Blood-Red Glister in the Stonecomb.