From the back of the book: Random encounters are a staple of any role playing session. Whether low or high level[,] any unexpectedly encountering monsters is part of the trade. In Encounters Tables and Monster Index you'll find a host of tables that bring almost every monster in the Monsters & Treasure into play. Roll 'em up! Encounter Tables and Monsters Index also includes a list of monsters and their vital statistics for quick reference. [sic]