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Chaosium, (kay-OSS-ee-yum) is known for publishing high quality books & games, and for having a well-developed sense of fun.

In 1975 we were founded as The Chaosium. In 1980 we incorporated as Chaosium Inc. Chaosium thrives in the mild climate, gorgeous surroundings, and gentle earthquakes of the San Francisco Bay Area.

Our main office is in Hayward, located about half-way between San Francisco and San Jose. A short walk away is a very good micro-brewery (and one of the oldest!) and Charlie Krank’s home. Charlie is our president and resident BBQ expert.

Most of Chaosium's product lines are based upon literary sources. H.P. Lovecraft's 1920's horror fiction provides the basis of our classic Call of Cthulhu roleplaying game line which has won so many awards that we have lost count, though we do know that there are more than 70 of them. Mr. Lovecraft also provides the inspiration for our many Chaosium Fiction collections. We are now expanding our fiction offering to include other, related, genres.

 
 Hottest Horror, Low Level from Chaosium

 
 Newest Titles in This Section
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Canis Mysterium

Canis Mysterium


Constable Clark of Coldwater Falls, was desperate for attention. He'd been in touch with every sanatorium and hospital from New York to Boston and there's not an empty bed to be found since the stock market crash of last year. They're full to brimming with suicidal businessmen and investors. He is holding a man in his jail exhibiting some rather extraordinary behaviors. The delusion is complete...   [click here for more]
Chaosium  $6.02 $4.52

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Dead Light

Dead Light


The storm had been brewing for days and now it hits! Combined with restless, idle youth and the desire for easy money, something has been released out there amid the darkness, the howling wind, and lashing rain. Dead Light is an adventure scenario for the Call of Cthulhu roleplaying system designed to be played in one or more gaming sessions. An exercise in Lovecraftian-flavored...   [click here for more]
Chaosium  $5.95 $4.46

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Fatal Experiments

Fatal Experiments


Fatal Experiments is a collection of three independent 1920's adventures for the Call of Cthulhu roleplaying game. Two of the three scenarios are suitable for both beginning and experienced players, making this book a perfect companion for first-time buyers of the Call of Cthulhu game system. The remaining adventure is unusually dangerous -- to be played only by experienced, follhardy...   [click here for more]
Chaosium  $10.42 $7.82

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In the Shadows

In the Shadows


Three Scenarios for Call of Cthulhu A disappearance.    A plea for help.    The strike of sudden madness.   Fear forms where shadows begin. The Cthulhu Mythos hovers at the edges of reason and sanity. With their courage and intelligence, investigators can dare the unknown and the unknowable, and roll back a little of the darkness....   [click here for more]
Chaosium  $6.57 $4.93

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Last Rites

Last Rites


Four challenging horrors for today. A book of wretched poetry, an incautious summoning, a Satanic coven, and a house with a suspicious history are the basic ingredients. Useful as stand-alone adventures, or for a change of pace when inserted into an ongoing campaign. Though suitable for beginning player characters, these adventures are dangerous, and incautious beginners will come to regret rash decisions....   [click here for more]
Chaosium  $8.22 $6.17

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Outpost 19

Outpost 19


Outpost 19 is the designation of Vascon Corporation's archaeological research station on the frontier colony world of Jeterieff V, a site that has been quarantined because of the outbreak of an unidentified disease. Can the medical trouble-shooters scrambled via Gate from the Tripoint Facility Medical Center contain the outbreak? Or will they discover that something more sinister is behind the crisis?...   [click here for more]
Chaosium  $6.95 $5.21

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Queensguard

Queensguard


A Steampunk Call of Cthulhu Campaign Welcome to Queensguard! Queensguard is a short campaign for the Call of Cthulhu roleplaying game. It is set in an alternate version of America in which steam technology and magic are woven into the fabric of society. Queensguard is divided into two acts, each of which should consume approximately two four-hour...   [click here for more]
Chaosium  $7.95 $5.96

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Ravenstone Sanitarium

Ravenstone Sanitarium


Two Adventures Concerning One Disturbing Institution When you think of a traditional game of Call of Cthulhu one element probably comes to mind—Sanity Checks. Beginning the scenario with a sound mind, characters progressively find themselves face to face with unspeakable terror that cause them to test their sanity. If their mind fails them, their characters become mentally unstable. Ravenstone...   [click here for more]
Chaosium  $7.95 $5.96

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Secrets

Secrets


Call of Cthulhu: Secrets We all hold a few dark, deep secrets close to their hearts. Some of our secrets are small and would seem unimportant if they were exposed to the light of day. Others are big and could change the world. This book is about secrets that have been allowed to fester and darken in the shadows. What was hidden in Robert Monroe-Tylor's coffin? What horror left Jason Andrews to die...   [click here for more]
Chaosium  $4.92 $3.69

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Shadows of Yog-Sothoth

Shadows of Yog-Sothoth


A GLOBAL CAMPAIGN TO SAVE MANKIND! The Silver Twilight is an international organization dedicated to the destruction of the human race. As brave Investigators, you must piece together passages from esoteric books, shards of ancient artifacts, and puzzling letters to discover the Silver Twilight's loathsome goals. This multi-chapter adventure begins in Boston and spans the globe. The Investigators...   [click here for more]
Chaosium  $13.17 $9.88

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Trail of Tsathogghua

Trail of Tsathogghua


Tsathogghua's curse awaits the unwelcomed investigators of the occult and unknown. What grim secret lurks on the sterile Greenland icecap? What living horror grows behind the "Bigfoot" legend? TRAIL OF TSATHOGGHUA contains a mini-campaign in two scenarios as well as a third, unconnected, scenario— "The Haunted House." This scenario pack is suitable for beginning...   [click here for more]
Chaosium  $5.47 $4.10

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