From the back of the book: "This book is an encyclopedia of the strange, the bizarre, and the deadly. It contains complete statistics for 265 monstrous and dangerous creatures, created by dungeon masters across the United States and Canada. Each monster is rated for hit dice, armor class, movement, whether and how well it swims and flies, its intelligence range, dexterity, alignment, normal habitat, the probability of it being present in its lair, by a die roll for number present, the probability of the presence of treasure and its type, how it attacks, and a description of general appearance and special characteristics."