Not sure if anyone remembers Vader Sessions that was based on episode 4 and 5 by which James Earl Jones had other voice overs from his other movies outside of Star wars, I had an idea that came to me about Vader and Kylo Ren; After Kylo Ren speaks to Snoke, he goes back to his quarters and speaks to Vader about his disturbance in the force, specifically his pull to the light. He goes on saying Snoke senses his disturbance but he wants Vader to show him the Dark Side so he can finish what Vader started. After Kylo Ren's finish speaking, Vader's spirit comes out of the helmet like a genie in a lamp and speaks to Kylo. He tells him of his nervous breakdown after 14 years on the force and how it came over him without any warning at all. When he finds out what happens with Vader, how would Kylo Ren react?