In Star Wars episode 9 the rise of skywalker, palpatine writes in his journal about many people, jedi, sith, events and weapons. This journal was later turned into the book Secrets of the Sith, which is a canon book covering Palpatine's thoughts on many things and topics.
Today's episode goes over Palpatine's thoughts on Kylo Ren's lightsaber crystal and why it actually spits fire.
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