The Orianis Union is made up of three races from habitable planets all from the Orianis system, The Oria formed the idea roughly four centuries ago and it has grown from there. It was started as a trade union to facilitate free trade among the three races. Since it’s origins it’s grown to dominated the political structures of all three races. They have expanded outward into space and continued developing trade relations with new cultures.
They encountered the CASE 123 years ago and the CASE and Idia in particular get along fairly well. In fact several ship designs developed by the Idia were with assistance from the CASE.