From the publisher:Continuing Mongoose Publishings highly-successful Classic Play series, the Book of Encounters, is a 256 page hardback that delivers a wealth of material for Games Masters to use in their campaigns. Containing a mix of encounter tables, fully-fleshed out encounters, compatible with both 3.5 and standard 3.0 as well as making allowance for a Games Masters own creatures, if your players adventure overground or oversea then you need this book.With detailed encounter maps, ideas for expanding and integrating the encounters as well as notes for Games Masters on how to interlink, develop and use even a random encounter to flesh out their games, the Book of Encounters is the most comprehensive tome yet produced for monster encounters. - BoardGameGeek