/Film provided a rundown of this Rogue One mystery, using a variety of sources including the Art of Rogue One book and tweets from Lucasfilm’s Pablo Hidalgo.
While Vader’s slaughtering of helpless Rebel soldiers excited many fans, his initial appearance in Rogue One also generated much discussion.
Rogue One: A Star Wars Story dealt more with new characters like Jyn Erso and Director Orson Krennic, but there was one familiar face that loomed large over the proceedings: Darth Vader.
One of the rooms in the castle contains a bacta tank, where Vader goes to meditate and “replenish his depleted body.”