The Book of Mystic Wisdom comes with Ultima IV. It is 61 pages long. In-game, Philpop the Weary is the author of the book. In real-life, Dave Albert has written the book. The book is mentioned in the in-game introduction to Ultima IV, where the player's alter ego doesn't dare to open it because of its magical properties.
The following topics are part of the book:
The book has many large illustrations, including one for each spell. Also, the cover of the book has metallic-looking rune letters, which enhance the illusion of it being a real spellbook.