The Grimoire of Honorius is an infamous book of magic Kaori Saeki has in her collection. Its manuscript was supposedly written by Pope Honorius IIIWP during the 13th century. However, it was the false pope Cardus that was the true author. The rituals described in the book have been strongly inspired by Catholic Mass ceremonies and the text contains numerous spells that claim to have been approved by the Pope himself. Legend tells that one can use the book to find the location of the Knights Templar.