The Stars are Right! Sandy Petersen's Cthulhu Mythos is the definitive volume of all things Cthulhu for the Pathfinder Roleplaying Game system. Sandy Petersen, the author of the Call of Cthulhu roleplaying game (and first game to feature and extensively explore the Cthulhu Mythos) nos presents an updated interpretation of Great Old Ones, monsters, cults and cultists, magic, artifacts, and other Cthulhu lore. Inside you'll find over 40 new Mythos Monster stat blocks, as well as a separate bestiary of over 60 stat blocks of Mythos monsters reprinted from Pathfinder Roleplaying Game source books. Together with over 100 monsters, this book serves as a one stop source for any Mythos monster encounter for your game! New rules for encountering Great Old Ones, the vast cosmically powerful entities of the Cthulhu Mythos, are presented as well. Cthulhu and his friends are far too powerful to serve as mere encounters with a normal stat block. Instead, this book presents them with an Elder Influence stat block, created to represent beings of enormous power. There are 25 Great Old Ones presented, from Abhoth to Tog-Sothoth, the Opener of the Way! It includes four new playable races: Dreamlands cats, ghouls, gnorri, and zoogs, as well as character options for all. To add flavor to your campaign we designed special insanity rules and included an enormous section on the cults and cultists of the Mythos. There are forty new spells, plenty of magic items, and a new magic system of rituals for cultists to use. This book is the most complete and comprehensive sourcebook for all things Cthulhu. We hope it does not drive you insane!