Well, not technically its Monster Manual, because James doesn't want one. But still, if there is a book that deserved to be, this is it.
This is the first rpg book ever where I bought the pdf, then liked it so much I ordered the hardcover, because I want to use the art in my games. Normally I could give two shits about art in rpg's. There is some art that I love, but never before has it caused me to buy a book just to use it in a game because of that art.
I can't wait to hold up the book and say "You're fighting this!" and see the looks on their faces.