 What company publishes the campaign setting in which Keléstia Productions produces materials for?
Keléstia Productions: Keléstia Productions publishes role-playing materials for use with Hârn, a fictitious setting. Keléstia Productions:  Keléstia Productions was created by N. Robin Crossby, the original creator of Hârn, after a contract dispute with publisher Columbia Games proved irresolvable. Hârn: Hârn is a campaign setting for fantasy role-playing games, designed by N. Robin Crossby and published by Columbia Games since 1983.
Columbia Games