Their idea was rejected, and Jeffrey instead asked Obsidian to create a follow-up to the BioWare-developed Star Wars: Knights of the Old Republic, as the team at Obsidian was familiar with the technology that the original game used.[1] The partnership between the two companies finalized in late 2003, and development of the game, which became Star Wars Knights of the Old Republic II: The Sith Lords, began in October 2003.[10] Obsidian was given 15 months to develop The Sith Lords.