While Darth Vader had a secret apprentice in Legends, there's a good reason why he didn't have one in the official Star Wars canon before trying to get Luke Skywalker to join him. As Emperor Palpatine's apprentice, Darth Vader tried multiple times to replace his master (according to the Sith's Rule of Two ). However, he never trained an acolyte.

Compared to the rest of the Empire hierarchy, Vader was very much an anomaly. However, this was intentional and by design. Despite having authority, Palpatine's Imperial system deliberately kept Vader on the outside to limit his power. However, changes to Vader's Imperial status can explain why he started making moves against Palpatine and tried to make Luke his apprentice.

The Imperial System Began To Fail By Rogue One

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