Book written by Ludvig Prinn 1542. Just before the author's death at the hands of the Inquisition, this book was smuggled out of his cell.

Latin version which was published one year after Prinn's death is consired to be most useful version of this book.

De vermis Mysteriis (also Mysteries of the Worm) is divided in 16 chapters, each dealing with different topics such as divination, necromancy, elementals and vampires. Latin version should include many spells.