A Demon Book is a magically imbuned book in which uses the properties of a book combined with magic to give it the ability to perform magical feats. It is a known weapon for both Sorcerers and Witches alike.
Demon Book's TextEdit
Magical feats originating from a Demon book seems influence by a "writing system" that allows the user to be able to perform magical feats. Some of these feats include summoning, create magical restraints, and transport objects/individuals into a separate dimension.