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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 the company was founded as The Chaosium. In 1980 it was incorporated as Chaosium Inc. Chaosium thrives in the mild climate, gorgeous surroundings, and gentle earthquakes of the San Francisco Bay area.

The 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 the classic Call of Cthulhu roleplaying game line which has won so many awards that the 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 Call of Cthulhu Fiction collections.

In 2010, Chaosium celebrated our 35th anniversary and in 2011, Call of Cthulhu its 30th!

Chaosium

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Call of Cthulhu Quick-Start Rules

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Malleus Monstrorum

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1920s Investigator's Companion

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Basic Gamemaster

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Cthulhu For President: The Game

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Call of Cthulhu

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Cthulhu Dark Ages

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Nephilim

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Cthulhu Live

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Nexus

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Call of Cthulhu

Call of Cthulhu


Horror Roleplaying in the Worlds of H. P. Lovecraft

The Great Old Ones ruled the earth aeons before the rise of humankind. Originally they came from the gulfs of space and were cast down by even greater beings. Remains of their cyclopean cities and forbidden knowledge can still be found on remote islands in the Pacific, buried amid the shifting sands of vast deserts, and in the frigid rece...   [click here for more]

Chaosium  $34.95 $19.22

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Call of Cthulhu Quick-Start Rules

Call of Cthulhu Quick-Start Rules


Horror Roleplaying in the Worlds of H.P. Lovecraft

The Great Old Ones ruled the earth aeons before the rise of humankind. Originally they came from the gulfs of space and were cast down by even greater beings. Remains of their cyclopean cities and forbidden knowledge can still be found on remote islands in the Pacific, buried amid the shifting sands of vast deserts, and in the frigid reces...   [click here for more]

Chaosium   FREE 

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Cthulhu Dark Ages

Cthulhu Dark Ages


Call of Cthulhu Roleplaying in the Year 1000 A.D.

The Dark Ages world is filled with life, death, and the pain of old age. Vengeful hordes wash across the world. Petty warlords fight among themselves like ravenous dogs. Disease runs rampant. Illiterate city-folk and simple farmers dread that which lurks in the dark. And in the greatest abbeys, a few know of forbidden books that speak of...   [click here for more]

Chaosium  $23.95 $13.17

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Nephilim

Nephilim


Science is an Illusion, History is a Lie. 

In ages past you lived many times. Your slaves built the Great Pyramid to honor your death; you died for the sins of Jerusalem; you lost your head suggesting they eat cake.

You are Nephilim – demi-god, prophet, saint, & magician from the mythic past.

Again you incarnate, to continue your ancient s...   [click here for more]

Chaosium  $34.95 $13.98

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1920s Investigator's Companion

1920s Investigator's Companion


An Essential Guide for Players

When faced with the horrors of the Cthulhu Mythos, investigators need all the help that they can get. This essential player's aid for Call of Cthulhu provides it.

The 1920s Investigator's Companionis split into four sections. "The Roaring Twenties" details life in the 1920s, ...   [click here for more]

Chaosium  $14.95 $8.22

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Basic Gamemaster

Basic Gamemaster


Running the Chaosium Roleplaying System

This book provides wisdom and advice on running Basic Roleplaying games. There are five main sections: the first discusses the duties of the gamemaster in devising and presenting roleplaying adventures. The second covers scenario-construction aids for the gamemaster including encounter tables, languages, treasures, and da...   [click here for more]

Chaosium  $11.95 $5.00

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Cthulhu For President: The Game

Cthulhu For President: The Game


The Aeon of the Elder Party Has Arrived!

A 9th Level Beer and Pretzels Role-Playing Game.* Have you lost all hope in the future? Tired of Big Government? Sick of greedy, corrupt officials? You are not alone! Become one with the Elder Party! The greatest evil in the universe just sunk to new depths, and has announced his intention to enter politics. Don't settle for the lesser evil! Heed...   [click here for more]

Chaosium  $15.00 $8.25

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Cthulhu Live

Cthulhu Live


Cthulhu Live is a full evening's worth of fun every time it is played. There are no winners and no losers, only a group of friends having a good time. The participants are both actors and audience. Cthulhu Live is set in the universe of eldritch horror created by Howard Phillips Lovecraft - typically play alternates between horror and comedy, as the participants put different spin...   [click here for more]

Chaosium  $16.95 $9.32

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Malleus Monstrorum

Malleus Monstrorum


That is not dead which can eternal lie, and with strange aeons even death may die. —H.P. Lovecraft Creatures, Gods, & Forbidden Knowledge

Here are those things which can “eternal lie”, and which have lived beyond human understanding for strange aeons. The Cthulhu Mythos is comprised of a complex and broad group of sometimes-contradictory entities, powers, ...   [click here for more]

Chaosium  $34.95 $19.22

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Nexus

Nexus


SECRET AGENTS from all over the world are converging, clandestinely, on a small science fiction convention. Coded transmissions have been intercepted, emanating from somewhere near the Con Suite. Fans have mysteriously disappeared, and stangers have shown up at the convention wearing their badges. And the rumor has it that some of these clever costumes aren't really costumes at all.

Liv...   [click here for more]

Chaosium  $19.95 $8.00

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Call of Cthulhu

01.Call of Cthulhu
02.1920s Investigator's Companion
03.Malleus Monstrorum
04.Cthulhu Dark Ages
05.Basic Gamemaster
06.Nephilim
07.Call of Cthulhu Quick-Start Rules
08.Cthulhu Live
09.Cthulhu For President: The Game
10.Nexus
 
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