Question:  What company publishes the campaign setting in which Keléstia Productions produces materials for?

Context paragraphs:
Hârn: Hârn is a campaign setting for fantasy role-playing games, designed by N. Robin Crossby and published by Columbia Games since 1983.

Keléstia Productions: Keléstia Productions publishes role-playing materials for use with Hârn, a fictitious setting.  Keléstia Productions was created by N. Robin Crossby, the original creator of Hârn, after a contract dispute with publisher Columbia Games proved irresolvable.

Faerûn: Faerûn is a fictional subcontinent, the primary setting of the "Dungeons & Dragons" world of "Forgotten Realms".  It is described in detail in the "Forgotten Realms Campaign Setting" (2001) from Wizards of the Coast, and various locales and aspects are described in more depth in separate campaign setting books.  Around a hundred novels and several computer and video games use the Faerûn setting.

Titanium Institute: The State Titanium Research and Design Institute is an institute that designs non-ferrous metallurgy works and produces materials used in the manufacture of semiconductors and carbon-graphite materials within Ukraine.  Institute placed in Zaporozhye.

Vulcan Productions: Vulcan Productions is a production company headquartered in Seattle, Washington, led by Paul Allen and Jody Allen.  Vulcan Productions produces feature films, educational films, and documentaries.  Their documentaries have won a number of Peabody Awards, including the 2007 award for "".

Campaign setting: A campaign setting is usually a fictional world which serves as a setting for a role-playing game or wargame campaign.  A "campaign" is a series of individual adventures, and a "campaign setting" is the world in which such adventures and campaigns take place.  Usually a campaign setting is designed for a specific game (such as the "Forgotten Realms" setting for "Dungeons & Dragons") or a specific genre of game (such as Medieval fantasy, or outer space/science fiction adventure).  There are numerous campaign settings available both in print and online.  In addition to published campaign settings available for purchase, many game masters create their own settings, often referred to as "homebrew" settings or worlds.

Unexpected Productions: Unexpected Productions (UP) is an improvisational comedy company in Seattle, Washington, USA.  From their home at the Market Theater in Seattle's historic Pike Place Market, in Post Alley, Unexpected Productions produces year-round shows, teaches improv classes, and hosts the Seattle International Festival of Improvisation.

Al-Qadim: Al-Qadim is an "Arabian Nights"-themed campaign setting for the "Dungeons & Dragons" role-playing game.  The setting was developed by Jeff Grubb for TSR, Inc., and was first released in 1992.  Al-Qadim is set in the land of Zakhara, called the "Land of Fate".  Thematically, the land of Zakhara is a blend of the historical Arabian Empire, the stories of legend, and a wealth of Hollywood cinematic history.  Zakhara is a peninsula on the continent of Faerûn in the world of Toril, the locale of the Forgotten Realms campaign setting, although Al-Qadim is designed to stand on its own or be added to any existing campaign setting.  The basic campaign setting was divided between two game products: "", a sourcebook describing character creation rules, equipment, and spells unique to the setting, and "Al-Qadim: Land of Fate", a boxed set describing the land of Zakhara, with separate sourcebooks for the players and the Dungeon Master.

World of Greyhawk Fantasy Game Setting: The World of Greyhawk Fantasy Game Setting and the World of Greyhawk Fantasy World Setting are two closely related publications from TSR, Inc. that detail the fictional "World of Greyhawk" campaign setting for the "Dungeons & Dragons" ("D&D") fantasy roleplaying game.  Both publications were authored by Gary Gygax, and they were the first stand-alone offerings to provide detailed, comprehensive information regarding a "D&D" campaign setting.

Oregon Catholic Press: OCP (formerly known as Oregon Catholic Press, and originally the Catholic Truth Society of Oregon) is an American liturgical publisher based in Portland, Oregon.  The not-for-profit company publishes liturgical music, books, choral collections, hymnals, missals, and support materials for the Catholic Church in English, Spanish, Vietnamese, Korean and Chinese.  "Spirit and Song", a division of OCP, publishes contemporary worship music for the Life Teen youth market.  OCP also publishes the "Catholic Sentinel", the diocesan newspaper for the Archdiocese of Portland.  OCP products are used in two-thirds of all Catholic churches in the U.S.

Supporting paragraphs: Keléstia Productions Hârn
Answer: Columbia Games