Call of Cthulhu RPG: Petersen's Abominations

Face the unthinkable horrors that even the Old Ones fear.

Enter a world of unspeakable terror with Petersen’s Abominations, a collection of five modern-era scenarios for the Call of Cthulhu roleplaying game, curated by Chaosium founder and legendary game designer Sandy Petersen. Each investigation will push your investigators to their physical, mental, and moral limits as they uncover apocalyptic secrets and confront abominations that defy all reason. Can you survive what lurks just beyond the veil of reality?

These scenarios are designed for mature players and experienced Keepers, offering intense horror, high stakes, and unpredictable twists. From isolated scientific installations to bizarre urban nightmares, Petersen’s Abominations showcases the most chilling and challenging aspects of Call of Cthulhu’s investigative horror gameplay.

Game Info

• Players: 2–6 (plus 1 Keeper)

• Ages: 16+

• Play Style: One-shots or short campaigns

• Publisher: Chaosium Inc.

Features

• Contains five complete modern-era scenarios written or inspired by Sandy Petersen

• Designed for Call of Cthulhu 7th Edition (adaptable for others)

• Each story emphasizes mystery, dread, and psychological horror

• Scenarios range in setting from urban sprawl to scientific outposts and cult-infested shadows

• Includes maps, NPCs, and handouts to immerse players fully in the mythos

• Ideal for fans seeking darker, more mature horror content with lasting impact

Why You'll Love It

Petersen’s Abominations is a chilling love letter to the mythos that started it all — crafted by one of the masters of Lovecraftian horror. Each scenario is a descent into madness, inviting experienced players and Keepers to explore the more brutal, mind-bending corners of the Call of Cthulhu universe. For those who crave complex investigations and terrifying payoffs, this collection is an essential addition to your RPG library. Prepare for fear beyond imagination — and abominations beyond belief.