The Ultima Underworld II Clue Book: Gems of Enlightenment is 80 pages long and contains maps, a walkthrough narrated by various characters, and a thorough explanation of the game engine and mechanics of Ultima Underworld II. It originally retailed for USD$14.95 and was published in 1993. It was written by Austin Grossman.
Though it doesn't explicitly say so, this was the first hintbook published after Origin merged with Electronic Arts in 1992. The EA trademark can be found on page 2.
- Gems of Enlightenment (PDF)