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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 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 Gaslight Equipment Catalogue

The Gaslight Equipment Catalogue


Being a Compendium of Various UsefulArticles and Sundries for the Victorian Era,Together With Information Pertaining to Their Use

This volume is more than just a price list: its aim is to provide both keeper and player with as much information as is possible within these few pages about the way people over a century past lived and worked -- the sorts of items that were available (and when they...   [click here for more]

Chaosium  $20.00 $11.00

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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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The Great Old Ones

The Great Old Ones


THE GREAT OLD ONES consists of a set of six scenarios for Call of Cthulhu: “The Spawn’’ is in the Wild West, with Indians, Wobblies, and bad guys; “Still Waters” is an adventure for people who hate to lend books; “Tell Me, Have You Seen the Yellow Sign?" makes a symbolic stop-over in New Orleans; “One In Darkness” fea...   [click here for more]

Chaosium  $17.95 $9.87

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The Green

The Green


Magical Adventures Beneath the Canopy

Some say it began as a garden planted by the old gods when the world was young, so they might shade themselves from the fiery sun and take rest from their divine pursuits. Others maintain that a strong, healthy magic infuses the mountain waters that feed it, giving its flora and fauna their prodigious health and si...   [click here for more]

Chaosium  $22.95 $12.62

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The House That Stands Alone

The House That Stands Alone


In the earth’s long history, many strange and outré things have fallen from the depths of space. In most cases, these things do not survive the journey to the surface. In other cases, terrible things make it to the earth, defiling it with their presence.

Learning of the dark history of an old lighthouse, the investigators will be drawn to Lonely Puffin Island, a grim rock i...   [click here for more]

Chaosium  $19.95 $10.97

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The Keeper's Companion vol. 1

The Keeper's Companion vol. 1


Blasphemous Knowledge, Forbidden Secrets,and Handy Information.

The Keeper's Companion vol. 1 is an invaluable resource for Call of Cthulhu keepers. New material includes advice for new keepers, a lengthy study of Mythos artifacts, a learned discussion of many occult books, an up-to-the-moment description of every facet of forensic medicine, a thorough revision and expansion of t...   [click here for more]

Chaosium  $25.95 $14.27

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The Keeper's Companion vol. 2

The Keeper's Companion vol. 2


Prohibition, Firearms, Tomes & Creatures

New to Call of Cthulhu? A battle-scarred veteran of many campaigns? Here are essential background articles useful to most keepers.

"The History Behind Prohibition" — A lengthy article bringing anti-alcohol advocates, law enforcement, gangsters, rum-runners, and consumers into focus. Lots of good stories. "The Keep...   [click here for more]
Chaosium  $23.95 $13.17

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The Magic Book

The Magic Book


Four Integrated Magic Systems for Basic Roleplaying

Magic pervades many worlds of the Basic Roleplaying game system, for in the game every adventurer — every character — has the capacity to manipulate invisible powers.

Though the beliefs of the user shape his or her approach to magic, all magic works by certain principles which stem from the life force of ...   [click here for more]

Chaosium  $14.95 $8.22

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The Pastores

The Pastores


A Malefic Cult for Cthulhu Dark Ages

The Pastores are a fertility cult rooted in an alliance of several noble families who worship Shub-Niggurath in her form of the Magna Mater, and a variety of other Mythos entities under the guise of her sacrificed Son. Their cultic practices involve the breeding, transformation, and periodic sacrifice of the human populace under thei...   [click here for more]

Chaosium  $16.00 $8.80

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The Primal State

The Primal State


A Campaign for Classic-Era Call of Cthulhu,Ideally set in Vermont, 1925-1930

To the Southern New-Englander entering Vermont for the first time there is sense of mystic revivification. On the towns of the lower coast the blight of mutation and modernity has descended. Weird metamorphoses and excrescences, architectural and topographical, mark a menacing tyranny of mechanism and vice-r...   [click here for more]

Chaosium  $22.00 $12.10

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The River Terror, and others

The River Terror, and others


Here are the winning entries from the 2009 Chaosium BRP Adventure Contest. Explore mythic Australia, battle for lost New Caledonia, assist Boston police in a kidnapping, and make a strategic strike against the Nazi Occult Bureau in the 1930s! These and other adventures take place in different times and places, for Basic Roleplaying and the Basic Roleplaying Quickstart rules...   [click here for more]

Chaosium  $25.95 $14.27

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The Stars Are Right!

The Stars Are Right!


The Taste of Ashes

THE NEW MILLENNIUM: a time wracked by violence, racism, AIDS, drug abuse, and all-consuming fear. Hollow politicians offer empty promises of the bright future - a thousand points of light which none can see.

That which is greater than mankind lurks beyond the rim of human consciousness. It patiently watches, waiting to assume command of our destiny. It preys o...   [click here for more]

Chaosium  $23.95 $13.17

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The Thing at the Threshold

The Thing at the Threshold


A dramatic chain of unsettling events over the past ten years leads to wholesale madness.

A complete campaign in three chapters detailed background for important characters extensive, deluxe player handouts ...   [click here for more]
Chaosium  $14.95 $8.22

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The Vault

The Vault


A Scenario of Darkness and Terror

This is a convention scenario with highly detailed characters and handouts intended for a theatrical style presentation in a single long session.

This adventure is intended for 4-6 players, and can be completed in a single 5-7 hour session. It is not a scenario for the squeamish keeper or players, and some may view the drama herein as harsh. The game b...   [click here for more]

Chaosium  $14.95 $8.22

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This Old Haunted House

This Old Haunted House


What is a Haunted House?

Is it a decaying mansion brimming with spires, turrets, and intricate grillwork? An abode of great age with its rotting façade and long-lost, eldritch secrets hidden inside, beneath decades of cobwebs and dust? Does it require spine-chilling drafts and creaking wood that causes stalwart investigators to calm their breathing in nervous anxiety? Or perhaps ...   [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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Toying With Humans

Toying With Humans


Four Origins Tournament Adventures

This book presents the Shoggoth.net Group's four Origins 2005 tournament adventures. Each scenario features one of man-kind's futile struggles against the Masks of Nyarlathotep and other powerful creatures of the Cthulhu Mythos. This monograph is intended for a mature audience.

The first scenario, "Where Byakhees Dare" takes veteran B...   [click here for more]

Chaosium  $19.95 $10.97

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Trail of Tsathogghua

Trail of Tsathogghua


Tsathogghua's curse awaits the unwelcomed investigators of the occult and unknown. What grim secret lurks on the sterile Greenland icecap? What living horror grows behind the "Bigfoot" legend? TRAIL OF TSATHOGGHUA contains a mini-campaign in two scenarios as well as a third, unconnected, scenario— "The Haunted House."

This scenario pack is su...   [click here for more]

Chaosium  $9.95 $5.47

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Trouble For HAVOC

Trouble For HAVOC


Three Superpowered Battles!

"We HAVOC supervillains are professionals who only want to do our job - creating as much havoc as possible. Why do these superheroes insist on getting in the way? A small reactor! Is that too much to ask?

If the superheroes don't want us to borrow federal property, we'd be glad to grab the power source...   [click here for more]

Chaosium  $10.95 $6.02

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Twilight Memoirs

Twilight Memoirs


Three Clues to Adventure

There is a certain vicarious thrill that can be experienced by reading the personal writings of others. Lovecraft certainly seemed to think so. His work is full of letters, diaries, research notebooks, and all manner of other documents. These were merely one of his many devices for the distillation of terror. This monograph is an attempt to capture the essence of Lovec...   [click here for more]

Chaosium  $12.95 $7.12

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Undying Leaders

Undying Leaders


An Exploration of Long-Lived Wizardsfrom the work of Lovecraft

The works of Howard Phillips Lovecraft contain several stories about old wizards who deal in forbidden knowledge and whom seek to either extend their lifespan, to regain their youth or obtain knowledge and skills to cheat death. Some also seek to increase their knowledge by bringing back others from the dead and forcing them to ans...   [click here for more]

Chaosium  $15.00 $8.25

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Unseen Masters

Unseen Masters


Modern Struggles Against Hidden Powers

"Who is among us? Who? I cannot utter a blessing while he is here. I cannot feel one. Where he treads, the earth is parched! Where he breathes, the air is fire! Where he feeds, the food is poison! Where he turns, his glance is lightning! Who is among us? Who?"

Melmoth the Wanderer<>...   [click here for more]

Chaosium  $20.95 $11.52

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Utatti Asfet

Utatti Asfet


A 1990s Campaign for Call of Cthulhu

The Graham Westlake Foundation sponsors the International Symposium on Unexplained Phenomena. This year, the fortieth annual symposium takes place in the Pacific island nation of Tonga. The investigators are among the attendees. There, they encounter evidence of phenomena they know only too well. Th...   [click here for more]

Chaosium  $20.95 $11.52

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Val-du-Loup

Val-du-Loup


Adventures in the Heart of the Ardennes Forests

A small, backward region of the dense, primal Ardennes forests. The Church wields little influence among the counties and baronies along the river Loup. Christian fervor clashes with Frankish and Celtic traditions. Barons feud for land, while greedy princes - the Prince-Bishop of Liège and the Count of Luxembourg ...   [click here for more]

Chaosium  $24.95 $13.72

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Ye Booke of Monsters

Ye Booke of Monsters


All About Monstres 

This volume contains dozens of new races and individual creatures for use with the Call of Cfhulhu roleplaying game. Included here are the following categories: Outer Gods, Elder Gods, Great Old Ones, Great Ones, Avatars, Servitor Races, Independent Races, Fabulous Creatures, and Unique Entities.

These monstro...   [click here for more]

Chaosium  $10.95 $6.02

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Ye Booke of Monstres II

Ye Booke of Monstres II


All About Monstres 

This volume contains dozens of new races and individual creatures for use with the Call of Cthulhu roleplaying game. Included here are the following categories: Outer Gods, Elder Gods, Great Old Ones, Great Ones, Avatars, Servitor Races, Independent Races, Fabulous Creatures, and Unique Entities.

These monstro...   [click here for more]

Chaosium  $11.95 $6.57

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