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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 Titles in Your Current Selection from Chaosium

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Once Men

Once Men


Science-Fiction Rules and Adventures for Call of Cthulhu This work provides science fiction rules for Call of Cthulhu as well as four adventures set in the future. Naturally enough, writing a science fiction supplement for a universe based on H.P. Lovecraft's Cthulhu Mythos proved a challenging endeavor. Lovecraft includes references to the future in some of his stories. Four of these...   [click here for more]
Chaosium  $27.95 $15.37

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Rise of the Dead

Rise of the Dead


This is a convention scenario with highly detailed characters and handouts intended for a theatrical style presentation in a single long session. The Arrival Six days ago the hammer fell. The red comet did not strike the planet, but it was a near miss. Fragments smashed into the earth bringing tidal waves, storms, and fallout. This was a rage of elemental destruction that devastated...   [click here for more]
Chaosium  $6.95

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Rise of the Dead II: The Raid

Rise of the Dead II: The Raid


This is a convention scenario with highly detailed characters and handouts intended for a theatrical style presentation in a single long session.   It is approximately 6:00 a.m. on March 26th, during the most horrific year of your life. A red comet nearly struck the earth, entering orbit, and breaking the known laws of physics in the process. Thousands of fragments of various...   [click here for more]
Chaosium  $6.95

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