From the publisher's website: The largest compilation ever of monsters for Swords & Wizardry/0e. If you play the very first edition (0e) of the game, or if you play Swords & Wizardry at the gaming table, this book is a must-have! 186 brand new monsters await, along with hundreds of the older monsters so that they're all in one book. from the introduction: This book is a resource for the Swords & Wizardry or 0e referee. It contains a huge number of monsters that never "officially" appeared for 0e (but that will be familiar to most of us from the 1e books). These monsters are statted for 0e, so some of them are slightly weaker than their 1e counterparts. It also contains a vast number of completely new monsters, and reprints the Swords & Wizardry monster entries... The new monsters are the result of a tremendous joining-together of resources by the internet community, not just those who play Swords & Wizardry or 0e, but Labyrinth Lord players, Moldvay Basic players, Basic Fantasy Roleplaying Game players, and OSRIC (1e) players... Compatibility information (for those who don't just convert on the fly) for use with Labyrinth Lord, BFRPG, and OSRIC is included... These monsters are all described in the fairly specifics-free style of 0e and Swords & Wizardry... None of the monsters have a listed alignment either, because it's up to you as the refereeto decide how these monsters should fit into your campaign. Obviously, most of them are Chaotic (or "Evil", depending on which system you play), and the descriptions are usually clear when this isn't the case.