i went to to the database link and found this. "the dark side energies flowing through Palpatine's body were so intense, that they ravaged his mortal frame. The very source of Palpatine's strength was killing him. To counter the dark side's consumption, Palpatine turned to a bizarre combination of technology and Sith magic. Palpatine used Spaarti cloning cylinders to create a store of younger bodies, and employed an ancient Sith technique to transfer his consciousness into a waiting clone. Thus, Palpatine could avoid death indefinitely -- as long as his supply of clones remained intact. He would change his form again and again, prolonging his life. Palpatine constructed a secret throne-world deep within the galaxy's core, on a shadowy world called Byss. Here, he kept his clones safe, protected by a loyal cadre of Dark Side Adepts" -star wars online databank i dont think he planned on dieing. what are the names of the books where luke skywalker turns to the darkside?