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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, Spanish (and English) from Chaosium

 
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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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Aces High

Aces High


The Mythic West ACES HIGH is a mythical, western role-playing game where Davey Crockett exists along side The Man With No Name. The relationship, however, may be an uneasy one. Violence is an everyday occurrence on the frontier of Civilization. Dust swirls around a crimson sun, reminding every one of their possible success, telling them of their mortality. Settlers make a grab for...   [click here for more]
Chaosium  $10.95

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Advanced Sorcery

Advanced Sorcery


Demons, Necromancy & High-Level Magic The worlds of fantasy are vast and diverse. Whether steeped in philosophy and existentialism, or action and carnage, the one commonality to all tales of fantasy is the influence of the supernatural on the natural world. Mages, wizards and sorcerers force the world to bend to their will. They grab the the fundamental essence of the universe and force...   [click here for more]
Chaosium  $23.95 $13.17

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Agents of the Crown

Agents of the Crown


Super Agents in Victorian England Serving Queen and Country AGENTS OF THE CROWN combines Victorian heroic action in the tradition of pulp stories, comic books, and the Penny Dreadfuls of the 19th century with the solid play and tremendous versatility of the Basic Roleplaying system. Agents of the Crown allows players to take the roles of super-agents in Victorian...   [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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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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Astounding Adventures

Astounding Adventures


Pulp Adventures for Basic Roleplaying Welcome to the heart-pounding, two-fisted, action-filled world of the Pulps! Throughout this book you will find Basic Roleplayingrules for new character types, skills, combat, magic, mad science, and a plethora of villains, henchmen and monsters. Accompanying the text are several sidebars containing special, optional rules to...   [click here for more]
Chaosium  $20.95 $11.52

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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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Berlin 61

Berlin 61


FOUR NATIONS, TWO SIDES, ONE CITY. WHO DO YOU BELIEVE? A setting for different BASIC ROLEPLAYING genres. Includes information on life in the city during the cold war, key locations, and special organizations. Battle spies, assassins, cultists and the Dark Herald Kototh. A great back-drop for espionage adventures in the 1960s style, and silver age superhero action! NOTE: this work was...   [click here for more]
Chaosium  $11.95

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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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BRP Adventures

BRP Adventures


BRP ADVENTURES presents thirteen adventures for the Basic Roleplaying system. These are drawn from the submissions for the first Basic Roleplaying Adventure Contest. Organized by genre, these stories illustrate the versatility of BRP and its adaptability to different kinds of storytelling. The following are the general genres and adventures included: FANTASY * Sharazar,...   [click here for more]
Chaosium  $13.95

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BRP Witchcraft

BRP Witchcraft


The village wise-woman creating herbal mixtures to cure her neighbours of the latest plague to curse their homes, the crone who disguises herself as a beautiful young woman to entice men to their doom, the travelling warlock who trades in potions and talismans which may or may not be truly magical. These are all examples of witches; men and women for whom witchcraft is an art and a profession. Within...   [click here for more]
Chaosium  $7.95

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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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Chronicle of the Awakenings

Chronicle of the Awakenings


This book contains several new resources for the player and gamemaster of Nephilim. At the front of the book are sixteen new Past Life eras for character generation. These eras also help fill in some of the timeline of Nephilim history. Following the new Past Life eras is a section of new Metamorphosis rules which change the way in which the Transformations work, and introduce the idea of passionate...   [click here for more]
Chaosium  $16.95 $9.32

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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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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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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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Liber Ka

Liber Ka


Liber Ka is a supplement for Nephilim introducing an updated, alternative magic system following authentic occult principles. The book includes: The Nephilim history of western sorcery. A grimoire of new spells. Information on the Magician Arcanum. Background on using sorcery in the modern world. An extensive bibliography on modern occult practices. ...   [click here for more]
Chaosium  $14.95 $8.22

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Light Without Shadow, Blade Without Edge

Light Without Shadow, Blade Without Edge


A Fantasy Adventure For BRP Heroes An ancient curse kills an obscure order of monks. Aeons later, the last island of human existence struggles against new masters of the world. Blood from those long-dead monks is the key to human salvation - and the last vial belongs to a vampire. You must steal it. BASIC ROLEPLAYING MONOGRAPHS are longer works by one or more authors on a subject of import...   [click here for more]
Chaosium  $6.95

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Major Arcana

Major Arcana


Major Arcana are the Mysteries of the Tarot, the Paths to Agartha, and the Tribes of the Nephilim. This sourcebook includes the secret history, symbolism, alliances, and initiatory rituals of the 22 Nephilim Arcana. Major Arcana Features: Rules for astral travel, divination, meditation, magical correspondence, and other arcane techniques Over 30 new...   [click here for more]
Chaosium  $21.95 $12.07

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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, and concepts...   [click here for more]
Chaosium  $34.95 $19.22

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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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Modern Equipment Catalog

Modern Equipment Catalog


Sometimes, Only the Best Will Do! If the professionals demand it, you'll find it here. The Modern Equipment Catalogue gives you all the best military, police and survival equipment along with all the tools you need to get the job done. It contains chapters on: Tactical Gear: Body armour, tactical carrying equipment, holsters and weapons accessories; Survival and Outdoors...   [click here for more]
Chaosium  $17.95

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