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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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Mythic Iceland

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The Ghosts in the House

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Cthulhu Invictus Fabulae

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Devil's Gulch

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Cthulhu Invictus Companion

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The Chronicles of Future Earth

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Cthulhu by Gaslight

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1990's Handbook

1990's Handbook


The ideas presented in this book attempt to be both mundane and fantastic at the same time— plausability is the key. 

It is in the details that the horror lies, because it is in the credibility of the details that the fantastic can rise and stand.

This, then, is a book of details, most mundane, some fantastic. They have but one purpose—that of bringing Lovecraft...   [click here for more]

Chaosium  $12.95 $7.12

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Arkham Now

Arkham Now


Revisiting the Legend-Haunted City

ARKHAM NOW updates to modern times the famous and fabled city of Arkham for the Call of Cthulhu roleplaying game.

Most residents believe there is only one horror lurking in this legendary haunted town — the urban sprawl slowly eroding Arkham's old New England beauty. Rushing by neon signs and mega-marts to obtain even more material...   [click here for more]

Chaosium  $27.95 $15.37

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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.

...   [click here for more]
Chaosium  $28.95 $15.92

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Cthulhu Invictus

Cthulhu Invictus


Horror Roleplaying in Ancient Rome

ROMAN CHILDREN TREMBLE in their beds as their mothers tell them stories of Medusa, the Hundred-Handed Ones, and the War of the Titans. They pray that the Fates have woven a long skein for them, free from encounters with the Minotaur and Cerberus. Little do they know that things more horrible than the creatures of myth and lege...   [click here for more]

Chaosium  $26.95 $14.82

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Cthulhu Invictus Bestiae

Cthulhu Invictus Bestiae


Horror Roleplaying in Ancient Rome

Here are new beasts and creatures for use with the Cthulhu Invictus setting of the Call of Cthulhu role-playing game.

THIS IS A DOWNLOADABLE PRODUCT. Two 8.5x11" pages.

...   [click here for more]
Chaosium   FREE 

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Cthulhu Invictus Companion

Cthulhu Invictus Companion


The Mythos Threatens Ancient Rome

AS ROME’S INFLUENCE SPREADS across the known world, so too spreads the worship of its gods. Roman leaders know that converting the people of conquered regions to the state religion makes them easier to control. But some gods have been worshipped longer than Rome has existed, and their supplicants won’t easily change allegiances.

...   [click here for more]
Chaosium  $12.95 $7.12

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Cthulhu Invictus Fabulae

Cthulhu Invictus Fabulae


Horror Roleplaying in Ancient Rome

Here are scenario seeds for use with the Cthulhu Invictus setting of the Call of Cthulhu role-playing game.

THIS IS A DOWNLOADABLE PRODUCT. One 8.5x11" page.

...   [click here for more]
Chaosium   FREE 

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Cthulhu Invictus Patrocinium

Cthulhu Invictus Patrocinium


Horror Roleplaying in Ancient Rome

Notes on Roman Patronage for use with the Cthulhu Invictus setting of the Call of Cthulhu role-playing game.

THIS IS A DOWNLOADABLE PRODUCT. One 8.5x11" page.

...   [click here for more]
Chaosium   FREE 

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Cthulhu Invictus Populus

Cthulhu Invictus Populus


Horror Roleplaying in Ancient Rome

Non-player characters for use with the Cthulhu Invictus setting of the Call of Cthulhu role-playing game.

THIS IS A DOWNLOADABLE PRODUCT. Two 8.5x11" pages.

...   [click here for more]
Chaosium   FREE 

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Devil's Gulch

Devil's Gulch


Basic Roleplaying Adventures in the Weird Wild West

Devil’s Gulch is a typical town of the American Old West from 1870 through 1885. It is a collection of buildings set along a single dirt road with side streets where private residences are found. It features saloons, a bank, a general store, and a church. Most buildings are made of wood, though some bo...   [click here for more]

Chaosium  $16.95 $9.32

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H.P. Lovecraft's Arkham

H.P. Lovecraft's Arkham


Unveiling the Legend-Haunted City

"Behind everything crouched the brooding, festering horror of the ancient town . . . the changeless, legend-haunted city of Arkham, with its clustering gambrel roofs that sway and sag over attics where witches hid from the King's men in the dark, olden days of the Province.

It was always a very bad time in Arkham . . . ."...   [click here for more]

Chaosium  $28.95 $15.92

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Investigator's Companion Vol. I

Investigator's Companion Vol. I


Hot Tips, Secret Info, & Sure-Fire Rules 

Are there flashlights in the 1920s? How about flashbulbs? What can your licensed private-eye do? Can your investigators buy a machine gun?

Too often, Call of Cthulhu investigators find themselves not only baffled by the mysteries of the Mythos, but baffled as well by day-to-day...   [click here for more]

Chaosium  $10.95 $6.02

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Kingdom of the Blind

Kingdom of the Blind


A Guide to the United Kingdom in the 1920s and 1930s

1921: the Empire upon which the sun never sets. From east to west, Dominions and colonies, from far-flung Hong Kong to Jamaica, India to Canada, stretch to encompass a quarter of the world's land and a quarter of its population. Upon every ocean a ship hoisting the Union Jack and armed with sixteen-inch guns, able to blow any other na...   [click here for more]

Chaosium  $21.95 $12.07

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Miskatonic University Guidebook

Miskatonic University Guidebook


The University Guidebook

The world sees Miskatonic University as a solid New England institution. Its professors and departments are on par with those of any Ivy League school—among the best in the nation.

Founded phsthumously in 1765 by seacaptain Jeremiah Orne, Miskatonic University grew from the acquired assets, and debts, of ailing Arkham College. Orne laid claim to the older...   [click here for more]

Chaosium  $12.95 $7.12

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Mysteries of Sudan

Mysteries of Sudan


Explore the Treasures and Madness of Africa's Largest Country

Sudan is the largest country in Africa and also one of the most inhospitable. A year when the rains are light, famine reigns. The average lifespan in Sudan during the Gaslight period was 33, which is similar to modern times. Widespread famine led to desperation, theft, murder cruelty and, in some cases, madness.

It was a tim...   [click here for more]

Chaosium  $16.95 $9.32

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Mysteries of the Raj

Mysteries of the Raj


Call of Cthulhu Adventure in 1890s India

The holdings of the British Empire included present day Pakistan, Bangladesh, Sri Lanka, Burma, and parts of Iran and Afghanistan. It was an area comparable in size to the continental United States, or Europe west of the Ukraine.

The historical background and religious traditions of the Indian subcontinent rival those of other re...   [click here for more]

Chaosium  $17.95 $9.87

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Mysteries of Tibet

Mysteries of Tibet


A Study of the Religion, People, and Mythology of Tibet

Though not directly mentioned by H.P. Lovecraft in any of his stories, there are several references throughout his works to the Himalayas. Like most young men with a sense of adventure during the late 1800's and early 1900's, Lovecraft would have been aware of any news stories coming out of Tibet. It was a mysterious country-until 1984 vi...   [click here for more]

Chaosium  $16.00 $8.80

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Mythic Iceland

Mythic Iceland


On the west of Norway comes the island called Iceland, with the mighty ocean washing round it: a land very squalid to dwell in, but noteworthy for marvels, both strange occurrences and objects that pass belief.

The Danish History, by Saxo Grammaticus, 12th Century

Legend and Adventure in Viking-Age Ic...   [click here for more]
Chaosium  $34.95 $19.22

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Nephilim Gamemaster's Companion

Nephilim Gamemaster's Companion


 Indespensible Resources for the Nephilim Gamemaster

The secret history of the Nephilim, composing a timeline from the beginning of the universe to the end of the world as we know it. Rules for artifacts and sentient relics of amazing power. A bestiary of new elemental creatures. Gamemaster's advice on starting and running a Nephilim campaign. Advi...   [click here for more]
Chaosium  $14.95 $8.22

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Ramsey Campbell's Goatswood

Ramsey Campbell's Goatswood


A Severn Valley Sourcebook and Open Campaign

"The castle came into view as I turned the corner and left behind me a row of untenanted cottages. It was set on the crest of a hill, three walls still standing, though the roof had long ago collapsed. A lone tower stood like a charred finger against the pale sky, and I momentarily wondered if this were the tower around whose window bats ha...   [click here for more]

Chaosium  $27.95 $15.37

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Secrets of Los Angeles

Secrets of Los Angeles


LOS ANGELES IN THE 1920s was a fast-growing, fast-moving city that encompassed all that was great and all that was rotten in America. Racial, ethnic, and religious melting pots presaged what the whole country would become by the end of the century. L.A. nonetheless clung to a veneer of White Protestantism more in line with farm-belt states in the Midwest. The newly-rich built pleasure pa...   [click here for more]

Chaosium  $24.95 $13.72

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Secrets of Morocco

Secrets of Morocco


Eldritch Explorations in the Ancient Kingdom

WELCOME TO THE SECRETS OF  MOROCCO! This book provides players with a civil, geographical, cultural, political, and Mythos tour of Morocco during the 1920s and 1930s. Morocco will seem like another world, with its cultural differences and its customs being foreign to many Westerners of the 1920s.

The country is vast, and no...   [click here for more]

Chaosium  $20.95 $11.52

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Secrets of New Orleans

Secrets of New Orleans


A 1920's Sourcebook to the Crescent City

NEW ORLEANS IN THE 1920s is a city of many faces. The gaiety of Mardi Gras is juxtaposed with the rampant corruption that earned New Orleans the nickname "The City That Care Forgot." The genteel decline of the French Quarter, the location of the city's original settlement, stands in contrast to the rich opulence of the Garden District, ...   [click here for more]

Chaosium  $16.95 $9.32

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Secrets of New York

Secrets of New York


The City that Never Sleeps

During the day ships, barges, tugs, and pleasure boats ply New York’s bay and rivers, dashing beneath bridges and disgorging thousands of people upon the city's shores. Each brings hope and dreams of a new life. At night the city blazes with myriad lights, diamonds dazzling in buildings that scrape the sky. Mu...   [click here for more]

Chaosium  $23.95 $13.17

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Secrets of San Francisco

Secrets of San Francisco


A 1920s Sourcebook for the City by the Bay

In all of North America there is no more perfect intersection of climate, culture, and colorful history than San Francisco — the culmination of Manifest Destiny, the Golden Gate to the Pacific Ocean, and the treasure house of the wealth of the great California Gold Rush. Purged of her wild, anarchic past by a devastating earthquake and fire at t...   [click here for more]

Chaosium  $24.95 $13.72

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Secrets of the Congo

Secrets of the Congo


Flying into the Heart of Darkness

The early 1920s saw the first, small commercial airlines. The aircraft, often flying boats, are sturdy and easily patched up but have few instruments for navigation. Flying is an art, not a science. This is especially so in the still-wild regions of the Dark Continent, Africa.

Darkest of all is the wilderness of Belgian Congo, in the very center of the...   [click here for more]

Chaosium  $21.95 $12.07

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Spirits & Dreams of the Viking Age

Spirits & Dreams of the Viking Age


Viking Magic & Horror for Cthulhu Dark Ages

This Cthulhu Dark Ages supplement focuses on magic and horror in the Viking Age. It describes the Norse world and its magic. It examines shamanistic traditions in Northern Europe and hypothesizes an Otherworld, its inhabitants, and its connections to the Cthulhu Mythos. It offers a set of spells for Investigato...   [click here for more]

Chaosium  $18.95 $10.42

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Terror Australis

Terror Australis


TERROR AUSTRALIS includes three roleplaying adventures, "Old Fellow that Bunyip," "Pride of Yirrimburra," and "City Beneath the Sands," as well as extensive information about the Aboriginal inhabitants, their mystical concept of Dreamtime, inhabitants of the Dreamtime, Australian history, transportation in the 1920's, contemporary Australian slang, famous ...   [click here for more]

Chaosium  $17.95 $9.87

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The Bermuda Triangle

The Bermuda Triangle


What secrets lie within the Devil’s Triangle? Why was the Mary Celeste abandoned after is passed through the Triangle's waters? What caused the disappearance of an entire flight of Avengers in 1945? Why do electronics fail in the Triangle for no reason?

Now the answeres at last can be revealed. The Bermuda Triangle is a 1990’s sourcebook centered around the...   [click here for more]

Chaosium  $16.95 $9.32

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The Chronicles of Future Earth

The Chronicles of Future Earth


“In the last centuries of the Fifth Cycliad, a great malaise began to descend upon the lands of humankind. The great civilizations of Urth, which for Aeons had seemed on the verge of slumber, now finally began to rot from within. From the edges of the world the ever-present enemies drew close, their hungry claws poised to tear apart the delicate flesh of a fr...   [click here for more]

Chaosium  $18.95 $10.42

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The Cruel Empire of Tsan Chan

The Cruel Empire of Tsan Chan


Future History of the Cruel Empire of Tsan ChanBeing an account of the year Five Thousand and the creation of Empire

That cult would never die till the stars came right again, and the secret priests would take great Cthulhu from His tomb to revive His subjects and resume His rule of earth.

For the citizens of the Tsan Chan Empire, ...   [click here for more]

Chaosium  $14.95 $8.22

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The Ghosts in the House

The Ghosts in the House


The Ghosts in the House is a Call of Cthulhu campaign suitable for 3-6 beginning characters. The adventure emphasizes data collection and discussion over running and screaming, and thus it is suitable for beginning players as well as experienced ones. The first adventure is very long (it takes place over 3 weeks or more); the subsequent adventures are much sho...   [click here for more]

Chaosium  $12.95 $7.12

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This Old Haunted House, Too

This Old Haunted House, Too


Another collection of twenty-five (possibly) spook-filled American House plans from the 18th, 19th, and early 20th centuries for use in Call of Cthulhu and Basic Roleplaying, and other history-based roleplaying games. Includes Colonial Era Houses (1640-1770), New Republic Era Houses (1770-1850), Victorian Houses (1850-1900), Early 20th Century (1900-1930), and offers notes on how ...   [click here for more]

Chaosium  $13.95 $7.67

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Cthulhu by Gaslight

01.Cthulhu by Gaslight
02.Mythic Iceland
03.The Chronicles of Future Earth
04.Cthulhu Invictus Companion
05.Cthulhu Invictus
06.Devil's Gulch
07.Spirits & Dreams of the Viking Age
08.Investigator's Companion Vol. I
09.Secrets of San Francisco
10.Mysteries of the Raj
11.This Old Haunted House, Too
12.Kingdom of the Blind
13.Secrets of New York
14.Mysteries of Tibet
15.The Ghosts in the House
 
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