The Emperor is set to return in Star Wars: The Rise of Skywalker.
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It's possible the secret of Palpatine's resurrection lies in Darth Vader's mask.
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At the moment of death, a Sith can transfer their essence into a nearby relic...
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As was demonstrated in tie-in comics by Lord Momin.
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In fact, the Sith spirit possessing a relic can even "enflesh" itself at a dark side nexus.
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Could Palpatine have transferred his essence into Darth Vader's mask?
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If so, it could even be that Palpatine seduced Kylo Ren to the dark side all along.
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