DeAngelis and Solomon regretted the lack of mod support in Enemy Unknown so the modding aspect of XCOM 2 was increased significantly. Firaxis released the Unreal Development Kit, allowing players to create their own content. Solomon considered mod support a "win-win" method for both players and the company, saying it can increase the game's longevity. Firaxis realized the modding potential of the series when they discovered a mod for Enemy Unknown called Long War. Firaxis partnered with Long War Studios (now Pavonis Interactive) to develop three day-one mods for the game. On January 19, 2017, Pavonis Interactive launched Long War 2 for XCOM 2.
