This book, the Keeper Rulebook, contains the core rules, background, guidance, spells, and monsters of the game. It is intended for use by the Keeper of Arcane Lore (the Keeper) — that player who will ...

Chaosium’s classic investigative game of normal people going a bit mad in the face of unspeakable horrors is 40 this year. With that comes a new 40th Anniversary Edition of the Call of Cthulhu Keeper ...