One of those vital untold stories concerns how Kylo Ren transitioned from Snoke's enforcer to the Supreme Leader of the entire First Order, something the franchise is finally ready to reveal.
Kylo Ren is fixated on eliminating anything that has to do with his past, which is exactly why he could never be as powerful as Darth Vader.
Star Wars: Legacy of Vader traces Kylo Ren's journey as he becomes Supreme Leader of the First Order and tries to reconnect with the ghost of his grandfather, Darth Vader.