The Non-Canon Expert looks at how Darth Vader initially responded when learning that the Rebel Alliance, which was so easily and wrongfully dismissed by the Empire before the Battle of Yavin, was growing powerful and dangerous, explaining Darth Vader’s initial satisfaction when making this conclusion about the Empire’s enemy in the years prior to the Original Trilogy and then why the Sith Lord would come to regret this first conclusion years later. This is a Legends story for Darth Vader with information found in a number of Legends sources, but primarily within the Legends novel «Star Wars: Death Star» and «Star Wars: The Essential Guide to Warfare.»