Harmaticon
From Multiversal Omnipedia
The Harmaticon was a text written by Bartolomeo Corsi while exiled to the island of Stromboli after his possession by one of the Great Race of Yith. The Harmaticon, likely inspired by his experiences among the Yithians, contained Corsi's unusual views on the nature of sin, including sections similar to Dante's Inferno.