This book covers fantasy-setting characters in comic book-style drawing. It seems to be a compilation from some of his other fantasy art books (which I have not seen). Characters in this book are on the covers of others of his books. In fact, this book covers the exact same characters as in several others of his (very short) books. It's an all-in-one version.
This book begins with simple tutorials on materials and how to draw the head, hands, and feet. It then does about two step-by-step tutorials for each class in the title and shows a few more finished examples for you to try on your own. There is also a short section on drawing scenery.
I drew just one (a warrior) and was pleasantly surprised with my results.