I remember that Supreme Leader Snoke wore a peculiar ring that had certain markings engraved on it. I have seen those markings before in the statues in Palpatine’s office in Revenge of the Sith. Palpatine received those statues from his old master Darth Plagueis, a Sith Lord who allegedly cheated death. I think I may have found how Plagueis did it. It has to do with this ring. Apparently, this ring was created through the use of either Sith Sorcery or Sith Alchemy. I am betting that when the ring’s creator dies, their essence is transferred to the ring and they possess whoever wears the ring. Daisy Ridley, who plays Rey, almost leaked that Snoke really was Darth Plagueis all along. Apparently, Plagueis did save himself from death using that ring. In the canon books, Palpatine sensed a powerful presence in the dark side in the Unknown Regions. What if it was his old master regaining his strength as Supreme Leader Snoke? Also, what if this this wasn’t the only ring? What if Palpatine made one of his own to guarantee his own survival? That could explain why he is coming back. Palpatine made it clear that he no intention of anyone succeeding him as Emperor when he died, not even Darth Vader, so it is safe to assume he had taken measures to guarantee his resurrection. With his old master permanently dead by Kylo Ren’s hand, now would be the perfect time for Palpatine to reveal himself to the galaxy. I look forward to seeing if my theory is correct when The Rise of Skywalker comes.