Such a simple idea, and yet this supplement was required to fire the imagination. It is well written and thought provoking, well worth the asking price and yet the publisher lets you choose what you want to pay. I cannot emphasize enough how intuitive this book is, everything he tells you makes complete sense and while you may not need this book to come to the realizations that it puts forth, the way it reads quickly and explains the choices made will encourage you to try it while avoiding some of the pitfalls of trial and error. I highly recommend this for experienced gamers ready to try something different and for DMs so that they realize that while not as effective as PC classes even the weakest of NPC classes is capable of at least existing (I know I've encountered games where even random shmoes seem to be built with fighter levels)