If you’ve ever wondered why Darth Vader built a castle on Mustafar, Marvel has revealed the answer.
Warning: this article contains spoilers for Star Wars – Darth Vader #22!
2016’s Rogue One first introduced Vader’s sinister fortress into official Star Wars continuity, revealing that the Dark Lord of the Sith built a castle on the very world where Anakin Skywalker died. But as it turns out, there’s much more to the castle than just Vader’s need to get away from it all and have a spa day. It all ties into the return of Lord Momin, an ancient Sith Lord first introduced in the 2015 comic Star Wars: Lando.
Source: IGN.com The Secret of Darth Vader's Castle Revealed