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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... click to expand
 
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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's horror home to us...   [click here for more]
Chaosium  $12.95 $7.12

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A Nation Ransomed

A Nation Ransomed


A Modern Military Adventure for Basic Roleplaying A Chinese nuclear submarine bearing a dozen missiles,each with a nuclear warhead, reported a major mechanical malfunction and would return to port. The ship is late. World governments receive a broadcast from the captain of the lost submarine, demanding that Japan, Taiwan, and South Korea surrender to the Peoples Republic of China by midnight --...   [click here for more]
Chaosium  $5.95

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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 possessions,...   [click here for more]
Chaosium  $27.95 $15.37

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Ashes to Ashes

Ashes to Ashes


EXPLORING THE DARKER SIDE OF HUMAN NATURE The world is not a happy place. This Basic Roleplaying setting casts the adventurers as mavericks in a fantasy world that is losing a war it does not even know that it is fighting. Hidden demons and their mortal minions-many of whom do not even know who their masters truly are-manipulate events from the shadows, experimenting with social control mechanisms...   [click here for more]
Chaosium  $13.95

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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. CTHULHU...   [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 legend inhabit the world. A dark god...   [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. The...   [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 boast...   [click here for more]
Chaosium  $16.95 $9.32

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End Time

End Time


A Near-Future Setting for Call of Cthulhu This monograph explores humankind's future. We have left the Earth, traveling to other planets and the moons of our own solar system. Included here are notes on the Moon and mars colonies, advances in medicine and in the treatment of insanity, discussions of the hazards of space and in the living on other planets, and explorations of discoveries on...   [click here for more]
Chaosium  $7.95

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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 life in America during the Roaring Twenties. Discover...   [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 navy out...   [click here for more]
Chaosium  $11.95

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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 1690 institute...   [click here for more]
Chaosium  $12.95 $7.12

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Mysteries of Hungary

Mysteries of Hungary


History, Legends, and Background for Adventuring in 1920s Hungary This monograph is has been roughly translated into English from Hungarian.   An understanding of the thousand-year history of Hungary is vital for a good background. During the centuries, four nations have tried to rule the area now known as Hungary. German-Roman emperors brought the Hungarian crown into their...   [click here for more]
Chaosium  $7.95

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Mysteries of Ireland

Mysteries of Ireland


"Come Fairies, take me out of this dull world, for I would ride with you upon the wind and dance upon the mountains like a flame!" —William Butler Yeats From the hills the fairies whisper to lone strangers, “come join the dance”. Watching from beneath the waves are the Merrow, the dwellers of the deep.Strange noises and half-heard screams ring at night...   [click here for more]
Chaosium  $8.95

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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 time when the...   [click here for more]
Chaosium  $8.95

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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 regions such as the Middle...   [click here for more]
Chaosium  $9.95

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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 visited...   [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 Iceland The Nordic and Celtic peoples who settled Iceland in the 9th...   [click here for more]
Chaosium  $18.95

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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. Advice on plotting...   [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 had clustered...   [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 palaces...   [click here for more]
Chaosium  $13.95

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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 not every city...   [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, where...   [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. Music, food, dance, dark rituals, and clandestine...   [click here for more]
Chaosium  $12.95

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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 the beginning...   [click here for more]
Chaosium  $13.95

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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 continent....   [click here for more]
Chaosium  $11.95

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Secrets of Tibet

Secrets of Tibet


TIBET is a common term used in the western world to refer to a remote plateau situated north of the Himalayan mountain range in Asia. A land of high-altitude peaks, some areas are impossible to reach without modern technology. The land is populated with malevolent gods and monsters, and deep secrets lie sleeping in ancient tombs and vaults among Tibet s soaring mountains and deep valleys. Geologists...   [click here for more]
Chaosium  $27.95 $15.37

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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 Investigators and their adversaries....   [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 hauntings,...   [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 famous mystery...   [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 fruit a hundred millennia in the...   [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 Chan Being 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, the facts of the events concerning the rise of the Great...   [click here for more]
Chaosium  $14.95 $8.22

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The Dreaming Prince

The Dreaming Prince


Exploring the Extra-Human Consciousness of the Great Old Ones The Dreaming Prince is a supplement to Chaosium’s Call of Cthulhu Roleplaying system. This particular supplement is driven to explore the extra-human consciousness of the Great Old Ones, in particular Cthulhu. Cthulhu, in his namesake story, remains dreaming in sunken R’lyeh, transmitting his...   [click here for more]
Chaosium  $6.95

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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 shorter....   [click here for more]
Chaosium  $6.95

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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 to...   [click here for more]
Chaosium  $6.95

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