Battle of the Sith Lords (internally codenamed Damage and given the working title Maul) was the tagline for a Star Wars video game once in development by Red Fly Studio. The game was canceled on June 24, 2011. Red Fly employees linked the game's cancellation to Star Wars creator George Lucas' decision to sell Lucasfilm Ltd. and LucasArts to The Walt Disney Company.
LucasArts contracted Red Fly Studio to begin working on ideas, demos, and mechanics for a Star Wars game featuring Darth Maul, with prototyping for the game beginning on October 9th, 2010. Red Fly didn't know what story they were telling, although they originally had the idea of telling a story of Maul's origins and ending with his 'death' at the end of Star Wars: Episode I The Phantom Menace. However, LucasArts let them know that Darth Maul survived the events of The Phantom Menace, but didn't let them in on the Star Wars: The Clone Wars TV series' plot, which featured Maul's survival. Because of this, they didn't know how to tell their story, and just worked on the game with a plan of it being about stealth, as well as being action-centric.
George Lucas then revealed his interest in Darth Maul working with Darth Talon during a meeting with representatives of Red Fly. When George was told that this wouldn't work since Talon lived more than 170 years after Maul, he said it could instead be a descendant or clone of Maul. Red Fly then began working with this idea, and their game's story finally started coming together. The plot would've featured Maul and Talon pitted against Darth Krayt and his Sith army, with a developer of Red Fly saying Maul could strike at the Sith for going against the former Sith Rule of Two. Despite the project coming together, however, LucasArts wouldn't "sign off on any of the big-ticket items that would allow development to truly get underway."
The project became troubled when LucasArts suddenly stopped communicating with Red Fly. Red Fly found out from some members of LucasArts that something was wrong, before finally being told via email that the project was cancelled. At the time of its cancellation, the game's prototyping phase had just been finished.
As of October, 2015, Red Fly is working on resurrecting the game, specifically working on "a full next-gen demo of all things Maul to show to the powers that be." In the event that Electronic Arts and/or Disney are uninterested in Maul, Dan Borth (of Red Fly) has expressed hope that they could reskin the game to be more in line with their vision for Star Wars.