The idea of a "Dark Side Dyad" and the secret return of the Emperor in The Rise of Skywalker have clear roots in the Legends comic Dark Empire .
(formerly known as the Expanded Universe or EU ) is the vast continuity of Star Wars storytelling that existed prior to April 2014. It encompasses thousands of years of galactic history, millions of years before the Battle of Yavin (BBY) to more than 100 years after the Battle of Endor (ABY).
How many Death Stars? Sun Crusher (indestructible, fires supernovas). Darksaber (Hutts build a discount Death Star). Galaxy Gun (fires missiles through hyperspace). It became a parody of itself. Similarly, Luke became so absurdly powerful (moving black holes with the Force) that he was no longer relatable.
Long before the movies, the Sith and Jedi fought massive wars involving thousands of warriors. This era was popularized by the Knights of the Old Republic (KOTOR) video games and the Tales of the Jedi comics. It introduced iconic figures like and Darth Bane , the creator of the "Rule of Two," whose backstory remains one of the most acclaimed trilogies in Star Wars literature. 3. The New Jedi Order
If you're new, start here: