The Pathfinder Roleplaying Game: Bestiary is a hardcover book authored by Jason Bulmahn and published by Paizo Inc. It serves as a comprehensive resource for players and game masters in the Pathfinder Roleplaying Game. The book focuses on detailing various creatures and beings that can be encountered within the game, providing a wealth of inspiration and adventure opportunities for players and game masters alike. With its English language format, this Bestiary is a valuable addition to any Pathfinder RPG collection.