Bonfire of the Witches

A rather nasty tract written by an Omnian priest of the old school, said to be so mad he wouldn't be able to see sanity with a telescope. The author may or may not be the priest who later became the Cunning Man. Like many books in the Unseen University Library, its content and character give it an unpleasant mind of its own and allow it to function as a portal. The library at Keepsake Hall has a copy.