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Game publisher
Chaosium Inc. (/keɪˈɒsiəm/ kay-OSS-ee-əm) is a publisher of tabletop role-playing games established by Greg Stafford in 1975. Chaosium's major product
Chaosium
Tabletop horror role-playing game
associated Cthulhu Mythos. The game, often abbreviated as CoC, is published by Chaosium and was originally created by Sandy Petersen; it was first released in
Call of Cthulhu (role-playing game)
Call_of_Cthulhu_(role-playing_game)
humans, they are by no means friendly toward humans and often attack them. Chaosium's Call of Cthulhu role-playing game has reclassified the deities previously
List of Cthulhu Mythos deities
List_of_Cthulhu_Mythos_deities
American game designer (born 1955)
Petersen (born September 16, 1955) is an American game designer. He worked at Chaosium, contributing to the development of RuneQuest and creating the acclaimed
Sandy_Petersen
1895 short story collection by Robert W. Chambers
(2000). Joshi, S. T. (ed.). The Yellow Sign and Other Stories. Oakland, CA: Chaosium. p. xiv. ISBN 978-1-56882-126-9. Brian Stableford, "The King in Yellow"
The_King_in_Yellow
Role-playing game list
Dark, Chaosium Inc., 1985. Alone Against the Wendigo, Chaosium Inc., 1983. The Asylum & Other Tales, Chaosium Inc., 1983. At Your Door, Chaosium Inc.,
List_of_Call_of_Cthulhu_books
Fictional cosmic entity
company Chaosium. Although Chaosium stipulated that TSR could continue to use the material if each future edition featured a published credit to Chaosium, TSR
Cthulhu
or notable Great Old Ones are explained under separate subheadings. In Chaosium’s role-playing game Call of Cthulhu and other works, deities classified
List_of_Great_Old_Ones
Tabletop fantasy role-playing game
Earth. Originally published by AEG, 7th Sea is currently published by Chaosium. The game won an Origins Award in 2000 and six ENNIE Awards in 2017. Alderac
7th_Sea_(role-playing_game)
Fictional deity in the Cthulhu Mythos
(2nd ed.). Oakland, CA: Chaosium. ISBN 1-56882-119-0. Petersen, Sandy (April 2001). Call of Cthulhu (5th ed.). Oakland, CA: Chaosium. ISBN 1-56882-148-4.
Azathoth
Fantasy tabletop role-playing game
Stafford's mythical world of Glorantha. It was first published in 1978 by The Chaosium. Beginning in 1984, publication passed between a number of companies, including
RuneQuest
Militia & Mercenaries is a 1979 role-playing game supplement published by Chaosium for RuneQuest. Militia & Mercenaries is a supplement in which computer‑generated
Militia_&_Mercenaries
American artist and author (1865–1933)
Bleiler, Dover 1970 The Yellow Sign and Other Stories, edited by S.T. Joshi, Chaosium 2004 Sporting Blood: The Great Sports Detective Stories, edited by Ellery
Robert_W._Chambers
Historical fantasy tabletop role-playing game
Arthurian legend. It was originally written by Greg Stafford and published by Chaosium, then was acquired by Green Knight Publishing, who in turn passed on the
Pendragon_(role-playing_game)
Horror fiction tabletop role-playing game supplement
King of Chicago is a set of two adventures published by Chaosium in 1994 for the horror role-playing game Call of Cthulhu, itself based on the stories
King of Chicago (Call of Cthulhu)
King_of_Chicago_(Call_of_Cthulhu)
Fictional creature and deity
(1998). "Hastur". The Encyclopedia Cthulhiana (2nd ed.). Oakland, CA: Chaosium. pp. 136–7. ISBN 1-56882-119-0. Joshi, S. T.; David E. Schultz (2001).
Hastur
Arthurian role-playing game sourcebook
The Boy King is a sourcebook published by Chaosium in 1991 for the Arthurian role-playing game Pendragon that covers significant events during Arthur's
The_Boy_King_(Pendragon)
Horror tabletop role-playing game campaign
Adventures to Thwart the Dark God, is an adventure campaign first published by Chaosium in 1984 for the second edition of the horror role-playing game Call of
Masks_of_Nyarlathotep
Tabletop role-playing game system
role-playing game derived from the RuneQuest fantasy role-playing game. Chaosium released the BRP standalone booklet in 1980 in the boxed set release of
Basic_Role-Playing
the RuneQuest role-playing game. RuneQuest 1 & 2 products and edition by Chaosium: 4001 - RuneQuest 1 softcover Rulebook; Perrin, Steve; Turney, Ray & Friends
List_of_RuneQuest_supplements
1992 Role-playing supplement for Pendragon game
Spectre King is a 1992 role-playing supplement for Pendragon published by Chaosium. The Spectre King is a supplement in which five adventures are included
The_Spectre_King
Superhero-themed role-playing game
Superworld is a superhero-themed role-playing game published by Chaosium in 1983 that uses the generic Basic Role-Playing rules system. The game began
Superworld
Arthurian encyclopedia
written by Phyllis Ann Karr, with art by Jody Lee, edited and assembled by Chaosium, and published by Reston Publishing in 1983. Subsequent editions expanded
The_King_Arthur_Companion
Horror role-playing game adventures
Mansions of Madness is a collection of adventure scenarios published by Chaosium in 1990 for the horror role-playing game Call of Cthulhu, itself based
Mansions of Madness (Call of Cthulhu)
Mansions_of_Madness_(Call_of_Cthulhu)
Short story by Robert Bloch
creatures in Bloch's story were identified as shoggoths. Gaming company Chaosium, the creators and publishers of the Call of Cthulhu horror role-playing
Notebook Found in a Deserted House
Notebook_Found_in_a_Deserted_House
Role-playing game adventure
Stormbringer Companion is a 1985 role-playing game adventure published by Chaosium for Stormbringer. Demon Magic: The Second Stormbringer Companion is an
Demon Magic: The Second Stormbringer Companion
Demon_Magic:_The_Second_Stormbringer_Companion
Tabletop role-playing game
Roleplaying", is a fantasy tabletop role-playing game published under license by Chaosium in 1993. Based on the Elric of Melniboné books by Michael Moorcock, this
Elric!
Fictional character
Stormbringer role-playing game by the publisher Chaosium (Hawkmoon has also been so treated, as has Corum). In 1993 Chaosium released Elric! which still used their
Elric_of_Melniboné
Fantasy tabletop role-playing game supplement
from The Land Beyond The Wall of Sleep", is a supplement published by Chaosium in 1989 for the horror role-playing game Call of Cthulhu. It features creatures
S. Petersen's Field Guide to Creatures of the Dreamlands
S._Petersen's_Field_Guide_to_Creatures_of_the_Dreamlands
American game designer
Dragons. In 2024, he became the Executive Producer of role-playing games at Chaosium. Then in 2025, he left to work at Asmodee. Mearls is an alumnus of Dartmouth
Mike_Mearls
American adventure board game, first published 1987
designed by Richard Launius, originally published in 1987 by Chaosium. The game is based on Chaosium's roleplaying game Call of Cthulhu, which is set in the
Arkham_Horror
Role-playing game supplement
RuneQuest. Originally published by Chaosium in 1980, it was republished in 2017 in PDF format as part of Chaosium's RuneQuest: Classic Edition Kickstarter
Runemasters_(RuneQuest)
Tabletop horror role-playing game adventure
In the Shadows is an anthology of adventures published by Chaosium in 1995 for the 5th edition of the Lovecraftian horror role-playing game Call of Cthulhu
In the Shadows (Call of Cthulhu)
In_the_Shadows_(Call_of_Cthulhu)
Fantasy world created by Greg Stafford
was first introduced in the board game White Bear and Red Moon (1975) by Chaosium, and then in a number of other board, roleplaying and computer games, including
Glorantha
1982 Multi-genre tabletop role-playing game
role-playing games (RPGs) produced by Chaosium in 1982 that all used the Basic Role-Playing set of rules. Chaosium, like other early RPG publishers, created
Worlds_of_Wonder_(game)
Boxed tabletop role-playing game supplement
Big Rubble: The Deadly City is a supplement published by Chaosium in 1983 for the fantasy role-playing game RuneQuest. Big Rubble is a campaign setting
Big_Rubble:_The_Deadly_City
Fantasy role-playing game setting
Apple Lane is a collection of adventures published by Chaosium in 1978 for the fantasy role-playing game Runequest. It was the second set of adventures
Apple_Lane
Tabletop horror role-playing game
in 2017 for the horror role-playing game Call of Cthulhu published by Chaosium, itself based on the horror stories of H.P. Lovecraft. Harlem Unbound is
Harlem_Unbound
Australian author
co-authored with United States horror writer John Sunseri, was published by Chaosium in 2007. The novel went on to receive an Honourable Mention for Best Australian
David_Conyers
Series of short stories by American writer Lin Carter
in The Xothic Legend Cycle: The Complete Mythos Fiction of Lin Carter (Chaosium, 1997) Originally Carter had assembled some of these stories for a volume
Xothic_legend_cycle
Tabletop horror role-playing game supplement
Shadows of Yog-Sothoth is a series of adventures published by Chaosium in 1982 for the horror role-playing game Call of Cthulhu. Shadows of Yog-Sothoth
Shadows_of_Yog-Sothoth
Tabletop role-playing game
Stormbringer is a fantasy tabletop role-playing game published under license by Chaosium. Based on the Elric of Melniboné books by Michael Moorcock, the game takes
Stormbringer (role-playing game)
Stormbringer_(role-playing_game)
Melniboné is a 1993 role-playing supplement for Elric! published by Chaosium. Melniboné is a supplement in which Melniboné is detailed as a setting. Matthew
Melniboné_(Elric!)
Arthurian tabletop role-playing game supplement
fantasy tabletop role-playing game supplement for Pendragon published by Chaosium. Noble's Book is a supplement for the second edition of Pendragon, and
Noble's_Book
Fantasy tabletop role-playing game supplement
interactions with trolls, published under license by Avalon Hill in 1988 for Chaosium's fantasy role-playing game RuneQuest Into the Troll Realms includes three
Into_the_Troll_Realms
Escape from Innsmouth is a 1992 role-playing game supplement published by Chaosium for Call of Cthulhu. Large parts of this scenario would also be adapted
Escape_from_Innsmouth
Political parody of the US presidential election
company Chaosium publishes multiple games about Lovecraft's work, starting with the Call of Cthulhu horror role-playing game in 1981. In 1996, Chaosium published
Cthulhu_for_President
American game designer (1948–2018)
HeroQuest role-playing systems, founder of the role-playing game companies Chaosium and Issaries, designer of the White Bear and Red Moon, Nomad Gods, King
Greg_Stafford_(game_designer)
Tabletop horror role-playing game supplement
Blood Brothers 2 is an anthology of short adventures published by Chaosium in 1992 for the Lovecraftian horror role-playing game Call of Cthulhu. Blood
Blood_Brothers_2
Humorous WWII tabletop wargame
actually was in the movies", is a light-hearted board wargame published by Chaosium in 1980 that satirizes the tropes found in board wargames. Some critics
Panzer_Pranks
Fantasy tabletop role-playing game supplement
a supplemental product published by Chaosium in 1993 for the horror role-playing game Call of Cthulhu. Chaosium first published the Lovecraftian horror
Call of Cthulhu Investigator Sheets
Call_of_Cthulhu_Investigator_Sheets
Gamemaster's Companion is a 1996 role-playing game supplement published by Chaosium for Nephilim. Nephilim Gamemaster's Companion is a supplement in which
Nephilim Gamemaster's Companion
Nephilim_Gamemaster's_Companion
Stormbringer Companion is a role-playing game supplement published by Chaosium in 1983 for Stormbringer. Stormbringer Companion is a supplement which contains
Stormbringer_Companion
Tabletop role-playing game magazine
by Tadashi Ehara and Greg Stafford of Chaosium as a general-interest role-playing magazine. At that time Chaosium was primarily a board game publisher
Different_Worlds
Series of urban fantasy novels by Ben Aaronovitch
that a role-playing game based on the book series would be published by Chaosium. The game was released in PDF first on 30 November 2022, with the print
Rivers of London (book series)
Rivers_of_London_(book_series)
Role-playing game adventure
Valley is a 1991 role-playing adventure for Call of Cthulhu published by Chaosium. Tales of the Miskatonic Valley is an adventure collection in which six
Tales of the Miskatonic Valley
Tales_of_the_Miskatonic_Valley
Tabletop fantasy role-playing game supplement
written by Rudy Kraft, Jennell Jaquays, and Greg Stafford, and published by Chaosium in 1981. Griffin Mountain is a wilderness campaign setting for the RuneQuest
Griffin_Mountain
Tabletop fantasy role-playing game supplement
Stafford, and Sandy Petersen, with art by Lisa A. Free, and published by Chaosium in 1982. A second edition was published in 1988 by Avalon Hill. Both editions
Trollpak
Horror role-playing game supplement
Background in the Home of Miskatonic University", is a supplement published by Chaosium in 1990 for the horror role-playing game Call of Cthulhu, which itself
Arkham_Unveiled
American game designer (1946–2021)
best known for creating the tabletop role-playing game RuneQuest for Chaosium. Perrin earned a Bachelor of Arts in English from San Francisco State University
Steve_Perrin
American role-playing game web series actress
2022). "Pixel Circus plays Call of Cthulhu for Halloween - Sun Oct 30". Chaosium Inc. Retrieved 2023-07-28. "Ms. Pixel's Fantastical Circus: Call of Cthulhu
Aabria_Iyengar
Tabletop horror role-playing game supplement
Sinister and Macabre", is a collection of three adventures published by Chaosium in 1990 for the horror role-playing game Call of Cthulhu, itself based
Fatal_Experiments
Reprint in The Book of Eibon (Chaosium, 2002), edited by Robert M. Price. The latter notes that both the Crypt and Chaosium versions are the "later" version
Lin_Carter_bibliography
Horror role-playing game supplement
of Terror and Madness in the Days to Come", is a campaign published by Chaosium in 1990 for the horror role-playing game Call of Cthulhu, specifically
At_Your_Door
Cthulhu Dark Ages is a 2004 role-playing game supplement published by Chaosium for Call of Cthulhu. Cthulhu Dark Ages is a supplement in which the cosmic
Cthulhu_Dark_Ages
Horror short story by H. P. Lovecraft
Bloch (for more information, see Price's anthology The Book of Eibon (Chaosium, 2002, p. 191)). Author Lin Carter wrote stories which are pastiches of
The_Haunter_of_the_Dark
Tabletop fantasy role-playing game supplement
game supplement written by Sandy Petersen for RuneQuest, published by Chaosium. The Gateway Bestiary is a supplement of creatures with sections for creatures
The_Gateway_Bestiary
Fantasy tabletop role-playing game supplement
a boxed supplement published under license by Avalon Hill in 1985 for Chaosium's fantasy role-playing game RuneQuest. The fifth of their boxed supplements
Gods_of_Glorantha
Arthurian tabletop role-playing game supplement
written by Greg Stafford, with art by Tom Sullivan, and published by Chaosium in 1985. This was the first product for the award-winning Pendragon game
The_Pendragon_Campaign
Tabletop role-playing game supplement
Monsters is a series of fantasy role-playing game supplements published by Chaosium from 1977 to 1980. They were republished in PDF format in 2016. Edited
All_the_Worlds'_Monsters
American webcartoonist
conventions and appearing in their collaborations with Wizards of the Coast and Chaosium, Inc. Straub graduated from the University of California, Los Angeles,
Kris_Straub
Real and fictitious locations in New England related to H. P. Lovecraft's fiction
Miskatonic region. The term was coined by Keith Herber and then popularized by Chaosium, the producers of the Lovecraftian role-playing game Call of Cthulhu. Lovecraft
Lovecraft_Country
Role-playing game
The Great Old Ones is a collection of adventures published by Chaosium in 1989 for the horror role-playing game Call of Cthulhu. It won an Origins Award
The Great Old Ones (Call of Cthulhu)
The_Great_Old_Ones_(Call_of_Cthulhu)
Horror tabletop role-playing game adventure
Terror Australis is a supplement published by Chaosium in 1987 for the horror role-playing game Call of Cthulhu, itself based on the works of H. P. Lovecraft
Terror Australis: Call of Cthulhu in the Land Down Under
Terror_Australis:_Call_of_Cthulhu_in_the_Land_Down_Under
Tabletop role-playing game adventure
written by Larry DiTillio with art by Susan Seddon Boulet, and published by Chaosium in 1986. This was the first adventure published for the award winning game
The_Grey_Knight
1976 Tabletop fantasy role-playing game
Bunnies & Burrows Campaign" in Different Worlds, a magazine published by Chaosium. It detailed how to combine the world of Bunnies & Burrows with other fantasy
Bunnies_&_Burrows
Horror tabletop role-playing game supplement
by William A. Barton, with art by Kevin Ramos, and first published by Chaosium in 1986. This supplement provides information on role-playing in an alternate
Cthulhu_by_Gaslight
1991 role-playing supplement for Pendragon
Blood & Lust is a 1991 role-playing supplement for Pendragon published by Chaosium. Blood & Lust is a supplement in which information is provided about travelling
Blood_&_Lust
Call of Cthulhu adventure
Solitaire Adventure in Canada's Wilds, is a solo adventure published by Chaosium in 1985 for the horror role-playing game Call of Cthulhu. Written by Glen
Alone_Against_the_Wendigo
Science fiction tabletop role-playing game
The Ringworld science fiction role-playing game was published by Chaosium in 1984, using the Basic Role-Playing system for its rules and Larry Niven's
Ringworld_(role-playing_game)
2005 horror game
inspiration from another novella called The Shadow Out of Time as well as Chaosium's Call of Cthulhu role-playing game 1997 scenario Escape from Innsmouth
Call of Cthulhu: Dark Corners of the Earth
Call_of_Cthulhu:_Dark_Corners_of_the_Earth
Fantasy tabletop role-playing game supplement
Sword is a 1985 role-playing game adventure for Stormbringer published by Chaosium. Black Sword is the second adventure about the heroine Freyda Nikorn's
Black_Sword
Tabletop horror role-playing game campaign
Horror on the Orient Express is a campaign boxed set published by Chaosium in 1991 for the horror role-playing game Call of Cthulhu. In this adventure
Horror_on_the_Orient_Express
Lovecraftian creature
Daniel (1998). "Dagon". The Encyclopedia Cthulhiana (2nd ed.). Oakland, CA: Chaosium. p. 73. ISBN 1-56882-119-0. —"Deep Ones", pp. 81–82. Ibid. —"Hydra (Mother
Deep_One
Tabletop fantasy role-playing game setting
between nations that were once at war with each other. Greg Stafford of Chaosium played in the Arduin game run by Hargrave for a while around 1976, and
Arduin
Horror role-playing game supplement
Plethora of Plots and Adventures", is a collection of adventures published by Chaosium in 1990 for the horror role-playing game Call of Cthulhu, itself based
Cthulhu_Casebook
Tabletop fantasy role-playing game supplement
tabletop role-playing game supplement for RuneQuest. Originally published by Chaosium in 1983, it consisted of reprints of Wyrm's Footnotes magazine articles
RuneQuest_Companion
by Chaosium. The Hastur Cycle is an anthology in which short stories explore the mythology of Hastur. Shannon Appelcline noted that when Chaosium started
The_Hastur_Cycle
Call of Cthulhu adventure
The Fungi from Yuggoth is a set of eight adventures published by Chaosium in 1984 for the horror role-playing game Call of Cthulhu, itself based on the
The_Fungi_from_Yuggoth
Tabletop fantasy role-playing game supplement
Snakepipe Hollow is an adventure published by Chaosium in 1979 for the fantasy role-playing game RuneQuest, then revised and republished in various editions
Snakepipe_Hollow
Tabletop horror role-playing game supplement
is a 1986 role-playing game adventure for Call of Cthulhu published by Chaosium. Terror from the Stars contains two adventure scenarios involving mysterious
Terror_from_the_Stars
King of Sartar is a 1992 novel published by Chaosium. King of Sartar is a novel in which manuscripts regarding Dragon Pass and its hero Argrath are compiled
King_of_Sartar
Collection of horror role-playing adventures
Curse of Cthulhu is a collection of adventures published by Chaosium in 1990 for the horror role-playing game Call of Cthulhu, itself based on the works
Curse_of_Cthulhu
Tabletop horror role-playing game supplement
a 1985 role-playing game supplement for Call of Cthulhu, published by Chaosium. Fragments of Fear: The Second Cthulhu Companion is a 48-page supplement
Fragments of Fear: The Second Cthulhu Companion
Fragments_of_Fear:_The_Second_Cthulhu_Companion
American artist and game designer (1956–2024)
top role playing industry, Jaquays's writing and art were published by Chaosium, Metagaming, Steve Jackson Games, Flying Buffalo, West End Games, Iron
Jennell_Jaquays
Tabletop horror role-playing game campaign
The Complete Masks of Nyarlathotep is an adventure campaign published by Chaosium in 1996 for the horror role-playing game Call of Cthulhu; it is the third
The Complete Masks of Nyarlathotep
The_Complete_Masks_of_Nyarlathotep
Horror tabletop role-playing game supplement
The Cairo Guidebook is a supplement published by Chaosium in 1995 for the horror role-playing game Call of Cthulhu. The Cairo Guidebook is a 112-page softcover
The_Cairo_Guidebook
Cthulhu's Heirs is a 1994 fiction anthology published by Chaosium. Cthulhu's Heirs is an anthology in which short stories about the Cthulhu mythos are
Cthulhu's_Heirs
Tabletop horror role-playing game adventure
Trail of Tsathogghua is a trilogy of adventures published by Chaosium in 1984 for the horror role-playing game Call of Cthulhu, itself based on the works
Trail_of_Tsathogghua
Fantasy tabletop role-playing game supplement
tabletop role-playing game adventure for RuneQuest, originally published by Chaosium in 1978. Set in Greg Stafford's world of Glorantha, against the backdrop
Balastor's_Barracks
CHAOSIUM
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