Wait, How Does Reva Know Darth Vader's Biggest Secret?
Warning! SPOILERS for Obi-Wan Kenobi episode 2.
Obi-Wan Kenobi episode 2 revealed Reva knew Darth Vader's greatest secret: that he is really Anakin Skywalker. Emperor Palpatine kept Darth Vader's true identity in Star Wars a closely guarded secret, in part because it amused him to do so and in part because he believed a mysterious, monstrous being was far more terrifying. Only a handful of people knew the truth that Darth Vader was really Anakin Skywalker: key figures in the Empire and leaders in the Rebel Alliance who'd learned from the Jedi.
According to James Luceno's novel Tarkin, rumors swirled about Darth Vader's origin. Some claimed he was a counterpart to the Separatist leader General Grievous, held in reserve by Chancellor Palpatine during the Clone Wars in case the Jedi betrayed him and brought out after Star Wars' Order 66. "Many believed that the Emperor’s willingness to grant so much authority to such a being heralded the shape of things to come," Luceno writes, "for it was beyond dispute that Vader was the Empire’s first terror weapon." Given this is the case, many viewers were surprised when Obi-Wan Kenobi episode 2 saw Reva reveal she knew Darth Vader's true identity. Sensing Obi-Wan's shock when she mentioned Lord Vader, Reva confirmed Anakin Skywalker was still alive — also showing she knew what had happened on Mustafar.
Related: Obi-Wan Kenobi Episode 2 Ending Explained: Where Is Darth Vader?
The clear implication is that all the Inquisitors knew Darth Vader's true origins, which is indeed something of a surprise. Still, it does make sense from an in-universe perspective. Inquisitors were not Sith, but they served the Sith's purposes, trained in many dark side arts to hunt Jedi across the galaxy. They
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