Chaosium Call of Cthulhu Keeper RPG Rulebook - CHA23135-H

Chaosium's Call of Cthulhu Keeper Rulebook (CHA23135-H) is the core rulebook for running the Call of Cthulhu tabletop roleplaying game, built for the Keeper who guides players through H.P. Lovecraft's cosmic horror mythos. It covers the rules, tone, and tools needed to run investigative horror scenarios where sanity matters as much as survival. This is the Keeper-facing companion to the Investigator Handbook, written for the person running the game rather than the players at the table.

Inside you'll find guidance on building mysteries, portraying Mythos creatures and cultists, handling sanity loss, and pacing horror so it lands. The book supports both classic 1920s settings and contemporary-era play, giving Keepers flexibility in when and where their campaigns are set. It's aimed at Keepers of any experience level, from first-time GMs to those who've run other horror or investigative systems before.

Key Features

• Core rulebook for the Keeper (Game Master) role in Call of Cthulhu
• Includes guidance on running Mythos creatures, cultists, and horror scenarios
• Covers sanity mechanics and how to pace psychological horror
• Supports both 1920s classic era and modern-day settings
• Provides scenario-building advice and Keeper-specific tools not found in player materials

What's Included

• Call of Cthulhu Keeper Rulebook (hardback)