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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 Alternate History, Sourcebooks, Portuguese (and English) from Chaosium

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 Title    Publisher    Price  
Cthulhu by Gaslight

Cthulhu by Gaslight


Horror Roleplaying in 1890s England IN THE 1890s, Cthulhu and his minions share the globe with the mighty British Empire. But they owe allegiance to an empire of their own — a dark and cruel design on ownership of the world and on the dreams of humanity. Even among the green fields of rural England, only thoughtful and energetic intervention keeps the shadows at bay. CTHULHU...   [click here for more]
Chaosium  $28.95 $15.92

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Dark Designs

Dark Designs


Explore the occult in 1890s England. Particularly thorough background notes and unusual plots help keep the investigators on their toes. Streamlined investigator creation for the era: owning Gaslight is not necessary to use this book. ...   [click here for more]
Chaosium  $18.95 $10.42

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Extrico Tabula

Extrico Tabula


The Second Cthulhu Invictus Companion As a rule, men worry more about what they can't see than about what they can.   —Julius Caesar Fear of the unknown is mankind's earliest fear, his most basic. What is out there in the dark? What hidden dangers lie within the forest, over those mountains, across that ocean? As the empire expanded, it encountered...   [click here for more]
Chaosium  $14.95 $8.22

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Malum Umbra

Malum Umbra


The First Cthulhu Invictus Companion In suus domus procul R'lyeh mortuus Cthulhu exspecto somnium —Graffiti found scrawled throughout Pompeii following an earthquake, August 20th, 79 AD The translation of the above graffiti should be well known to most fans of the Cthulhu Mythos. It is "In his house at R'lyeh, dead Cthulhu waits dreaming". For a time the Roman...   [click here for more]
Chaosium  $7.95

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Ripples From Carcosa

Ripples From Carcosa


O do not seek to learn or even ask, What horror hides behind...The Pallid Mask! --Lin Carter, Litany to Hastur   OF ALL THE VARIED and mysterious Great Old Ones of the Cthulhu Mythos, few ensnare the imagination as easily as Hastur. The image of the silent, deserted city beside a dark, foreboding lake where sinister things lurk is one that stays with the reader. Many of us...   [click here for more]
Chaosium  $21.95 $10.95

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