The Book of Eibon, also called Eibon's Demon Book or simple Eibon's Book, is a Demon Book created by the Great Sorcerer and Great Old One of Knowledge, Eibon. Although the Book of Eibon exists in both the anime and manga, both differ in a variety of ways:
- Book of Eibon (Manga): The Book of Eibon was a Demon Book former owned by Eibon and has, since, been in used by the Icons within the series.
- Book of Eibon (Anime): In the anime, although the Book has a similar history, it was not used by the Icons and has a different history behind it. It is currently in the possession of the DWMA. In addition, the appearance of the Book differs.