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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 Sourcebooks, Call of Cthulhu from Chaosium

 
 Newest Titles in This Section
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A Cthulhian Miscellany

A Cthulhian Miscellany


Terrifying Tools and Reality-Wrenching Rules for Players and Keeper Alike Call of Cthulhu is, of course, an excellent role-playing system and one that easily lends itself to expansion in many areas. In keeping with that spirit, this book explores a number of optional expansions to the original Call of Cthulhu rules-primarily in the areas of new, specialized skills; new spells, books,...   [click here for more]
Chaosium  $9.95

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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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Atomic-Age Cthulhu

Atomic-Age Cthulhu


MYTHOS HORROR IN THE 1950s NEVER BEFORE had the world faced a threat as potentially devastating as the A-bomb -- and the even more lethal H-bomb that followed. Educational films showed how to "survive" a nuclear blast by crawling under a desk, as if a few inches of wood made any difference. In movie theaters, classic monsters of the '30s and '40s were replaced by...   [click here for more]
Chaosium  $31.95 $17.57

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Big Book of Cults

Big Book of Cults


Evil Cults for Call of Cthulhu This book contains a collection of modern-day organisations for use in your Call of Cthulhu games. The Church of a Thousand Tomorrows can nuke you from orbit, while the Sufferers' Guild could be brought down with a few well-placed phone calls. More importantly, all the personalities described have reasons for the things they do. Some of the characters want...   [click here for more]
Chaosium  $9.95

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Bride of Halloween Horror

Bride of Halloween Horror


Autumn — the time of the Festival of the Dead, when the veil between the worlds is thinnest and prayers to ancestors easiest made. Pumpkin cakes are left in the Ancestors' Niche in every house, and children tie black and orange ribbons to the doors and put candles in the windows of their houses so their dead ancestors can easily find their way home. It is a quiet time, after the harvest...   [click here for more]
Chaosium  $10.95

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Canis Mysterium

Canis Mysterium


Constable Clark of Coldwater Falls, was desperate for attention. He'd been in touch with every sanatorium and hospital from New York to Boston and there's not an empty bed to be found since the stock market crash of last year. They're full to brimming with suicidal businessmen and investors. He is holding a man in his jail exhibiting some rather extraordinary behaviors. The delusion is complete...   [click here for more]
Chaosium  $10.95 $6.02

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Children of the Storm

Children of the Storm


Call of Cthulhu in the Great Depression Experts predict that the want and suffering of the Great Depression will create "a generation of cannibals." Panicked people flee their homes to escape a devastating invasion and poison gas attack. Life comes to a standstill as people watch a strange dust descend from the sky. The spread of the Great Depression and the first rumblings of...   [click here for more]
Chaosium  $7.95

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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 Companion

Cthulhu Companion


Ghastly Adventures & Erudite Lore This book is composed of submissions to Different Worlds magazine and other Cthulhoid Chaosium projects. The Different Worlds readers’ enthusiasm for the Cthulhu Mythos resulted in many excellent submissions, some of which appear, with permission, within these pages. The contents of this supplement are quite varied. The first two...   [click here for more]
Chaosium  $7.95 $4.37

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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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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 spins on...   [click here for more]
Chaosium  $16.95 $9.32

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Cthulhu Now

Cthulhu Now


CTHULHU NOW includes four roleplaying adventures, "The City in the Sea," The Killer Out of Space," The Evil Stars," and "Dreams Dark and Deadly." Background essays provide new skills and occupations, up-to-date cash-flow information, an elaborate firearms article (and a foldout illustrating contemporary firearms), active and passive night-vision equipment, a survey...   [click here for more]
Chaosium  $21.95 $12.07

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Cthulhu Rising

Cthulhu Rising


Call of Cthulhu Roleplaying in the 23rd Century It is the year 2271. The future is a dark and dangerous place. Outer space is the new frontier - humanity exploits the galaxy for its own ends. It is more than a hundred and fifty years since the United Earth Federation began to colonise the solar system and beyond. Millions of colonists — employees of either the Federation or...   [click here for more]
Chaosium  $17.00 $9.35

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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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Dark Mirror

Dark Mirror


Gazing into the Dark Mirror This is the very worst wickedness, that we refuse to acknowledge the passionate evil that is in us. This makes us secret and rotten." -D. H. Lawrence CALL OF CTHULHU pits a dedicated group of investigators (controlled by the players) against a whole host of ills and evils. Sometimes the investigators are simply clearing up a localised problem where something has...   [click here for more]
Chaosium  $6.95

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Dead Light

Dead Light


The storm had been brewing for days and now it hits! Combined with restless, idle youth and the desire for easy money, something has been released out there amid the darkness, the howling wind, and lashing rain. Dead Light is an adventure scenario for the Call of Cthulhu roleplaying system designed to be played in one or more gaming sessions. An exercise in Lovecraftian-flavored...   [click here for more]
Chaosium  $5.95

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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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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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First Book of Things

First Book of Things


Items, Spells, and Creatures for Call of Cthulhu This work provides a variety of creatures, technological items and spells for the Call of Cthulhu role playing game. The work follows the conventions presented in the rulebook in regards to creature statistics. While most of the creatures presented are associated with the Mythos, many are not. The new Mythos creatures provide the Keeper...   [click here for more]
Chaosium  $7.95

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Fragments of Fear

Fragments of Fear


The Second Cthulhu Companion This second Call of Cthulhu companion answers questions common to Call of Cthulhu games, and reveals ancient linguistic traces of the dread Cthulhu cult among various cultures. It then summarizes all Mythos spells printed in Shadows of Yog-Sothoth, The Asylum, the Cthulhu Companion, The Fungi From Yuggoth, Curse of the Chthonians, Trail of Tsathogghua,...   [click here for more]
Chaosium  $5.95 $3.27

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H.P. Lovecraft's Dreamlands

H.P. Lovecraft's Dreamlands


Roleplaying Beyond the Veil of Sleep We all dream . . .   For some, dreams can become reality. H.P. Lovecraft's Dreamlands provides everything needed for Call of Cthulhu or Cthulhu Dark Ages investigators to travel down the seven hundred steps, through the Gates of Deeper Slumber, and into the realm of dreams. Includes a travelogue of the Dreamlands, a huge...   [click here for more]
Chaosium  $34.95 $19.22

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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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Investigators' Companion, vol. II

Investigators' Companion, vol. II


Occupations & Skills What, You Want To Live Forever?   Oh, just a little longer and a bit more pleasantly in the face of Mythos horrors. Let this book be your guide. On becoming an investigator contains valuable tips that can help your investigator reach middle age, and possibly even those golden years. The Occupations Section contains 140 different possible 1920s...   [click here for more]
Chaosium  $10.95 $6.02

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Jovian Nightmares

Jovian Nightmares


A SOURCEBOOK FOR CTHULHU RISINGCALL OF CTHULHU ROLEPLAYING IN THE 23RD CENTURY By the late 23rd century, the gas giant Jupiter and its sprawling system of rings and moons is home to a colonial population of millions. Over the century and a half since the colonisation of the outer planets began in earnest, an aggregation of settlements and outposts have developed to mine the...   [click here for more]
Chaosium  $9.95

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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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Legacies of the Renaissance

Legacies of the Renaissance


The Stone of Concordance In this scenario, set in Europe in 1928, the investigators travel between England and Crete, receiving a newspaper article along with a small note from their honoured friend William Tanislow. William, an English curator, has been recently commissioned to work alongside the famous biologist Dr. Harold Bantry. The photograph accompanying the article is dated late April 1928...   [click here for more]
Chaosium  $6.95

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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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Masks of Nyarlathotep

Masks of Nyarlathotep


Perilous Adventures to Thwart the Dark God At last the stars are almost right! Soon Nyarlathotep's plans will come to fruition. Then the world will be changed irrevocably — but not quite yet. Pesky human investigators have learned much. Now they must survive long enough to make sense of what they know, and take resolute action. Masks of Nyarlathotep is a Lovecraftian...   [click here for more]
Chaosium  $34.95 $19.22

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Miskatonic University

Miskatonic University


A Handbook to the Pride of Arkham MISKATONIC UNIVERSITY is a small, seemingly typical New England college nestled in the bosom of conservative Arkham, Massachusetts. A poor cousin to such hallowed institutions as Harvard, Brown, and Princeton (the term “Ivy League” won’t come into use until 1936), Miskatonic nonetheless offers coveted degrees in a wide variety of subjects...   [click here for more]
Chaosium  $16.95

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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 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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Mythos Magic

Mythos Magic


An Optional Magic System for Call of Cthulhu and Basic Roleplaying For decades magic has been a backbone and prominent feature of Call of Cthulhu. Whether it is a race to stop the summoning of some god or alien, the need to communicate with things on other worlds by means of arcane scripture, or solving murders done with hexes rather than guns, magic has been inevitably wedded...   [click here for more]
Chaosium  $9.95

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Once Men

Once Men


Science-Fiction Rules and Adventures for Call of Cthulhu This work provides science fiction rules for Call of Cthulhu as well as four adventures set in the future. Naturally enough, writing a science fiction supplement for a universe based on H.P. Lovecraft's Cthulhu Mythos proved a challenging endeavor. Lovecraft includes references to the future in some of his stories. Four of these...   [click here for more]
Chaosium  $27.95 $15.37

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Parapsychologist's Handbook

Parapsychologist's Handbook


A Monograph for the 1890's, 1920's, & Contemporary Adventures This monograph reveals the real-world science of the paranormal, Parapsychology (its history and methods), how to play a parapsychologist, how to run a Call of Cthulhu campaign centered around a ghost-hunting group, and how to simulate various non-Mythos entities and psychic powers in your campaign. MISKATONIC UNIVERSITY...   [click here for more]
Chaosium  $10.95

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Plan 09 From Halloween

Plan 09 From Halloween


The festival came to town.   In previous years it was a joyful and cheery event. These attractions, however, are outmoded and the infrastructure is old and neglected. A foul smell hangs in the air. The show consists of malformed people who disgust and frighten. Little joy is offered by the twisted clowns, and the barker's outdated speaking-style and French-tinged accent strengthens...   [click here for more]
Chaosium  $7.95

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Queensguard

Queensguard


A Steampunk Call of Cthulhu Campaign Welcome to Queensguard! Queensguard is a short campaign for the Call of Cthulhu roleplaying game. It is set in an alternate version of America in which steam technology and magic are woven into the fabric of society. Queensguard is divided into two acts, each of which should consume approximately two four-hour...   [click here for more]
Chaosium  $7.95

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Raising Up

Raising Up


A Mini-Campaign for Call of Cthulhu The fight against the forces of the Mythos is fraught with peril and it is all too easy for even the strongest will to be tempted by the dark secrets whispered in the cold and empty places of the world. This monograph presents a series of adventures intended to provide a coherent, yet flexible, mini-campaign. These adventures center on Reginald Preston,...   [click here for more]
Chaosium  $6.95

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Ramblings of a Twisted Muse

Ramblings of a Twisted Muse


Time Runs Short! Unspeakable terror lies just on the edge of our collective consciousness. Creatures that were old when man first walked the earth dwell in a universe that holds terrible secrets. We are far below the top of the food chain! To elder beings such as these, our existence is but a mere annoyance. Some are merely content to bide their time until we eventually exterminate ourselves. Others...   [click here for more]
Chaosium  $13.95

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Ravenar Sagas

Ravenar Sagas


Three Viking Adventures for Cthulhu Dark Ages The Ravenar Sagas are a collection of three Cthulhu Dark Ages scenarios spanning a thirteen-year period between 989 AD and 1002 AD. The Sagas take place across Scandinavia and what will later be known as Nova Scotia. Players will be taking the roles of the crew of a small knorr (a Viking longship). While pre-generated characters are provided...   [click here for more]
Chaosium  $8.95

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Ravenstone Sanitarium

Ravenstone Sanitarium


Two Adventures Concerning One Disturbing Institution When you think of a traditional game of Call of Cthulhu one element probably comes to mind—Sanity Checks. Beginning the scenario with a sound mind, characters progressively find themselves face to face with unspeakable terror that cause them to test their sanity. If their mind fails them, their characters become mentally unstable. Ravenstone...   [click here for more]
Chaosium  $7.95

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Return of the Ripper

Return of the Ripper


An 1890s Scenario for Call of Cthulhu and Cthulhu By Gaslight RETURN OF THE RIPPER takes place in London, beginning in late summer to early autumn of 1893. It involves a new series of killings perpetrated by Jack the Ripper. The Ripper has returned to London to continue his bloody work after a five-year absence. Working in league with the Ripper are other occult horrors...   [click here for more]
Chaosium  $21.00 $11.95

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Ripples From Carcosa

Ripples From Carcosa


Confronting Hastur Across Time and Space Artists, poets, dreamers and madmen feel the hand of the Great Old Ones most keenly. The line between creative genius and abject madness is thin. We all have admired at least one favorite writer or musician who spiraled into insanity before taking his or her own life. Hastur dwells in that gray area between madness and genius. The King In Yellow, a play about...   [click here for more]
Chaosium  $10.45 $13.25

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Rise of the Dead

Rise of the Dead


This is a convention scenario with highly detailed characters and handouts intended for a theatrical style presentation in a single long session. The Arrival Six days ago the hammer fell. The red comet did not strike the planet, but it was a near miss. Fragments smashed into the earth bringing tidal waves, storms, and fallout. This was a rage of elemental destruction that devastated...   [click here for more]
Chaosium  $6.95

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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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