The content of this book is essentially similar to the Monster Manual already released, although the emphasis is more geared towards high level play. It includes both old favourites (gemstone dragons, for instance) and new creatures. Most of the concepts are interesting and well executed. My only gripe is that the artwork is somewhat patchy. Some pictures, like the phonix, are exquisite, whilst some are just plain awful. That said, this is a minor gripe and I highly recommend the book to any DM who has run out of original nasties to throw at his unsuspecting players.