Luke's mind flashes to the helmet in his apartment, shoved into a cupboard like it might stop its presence from permeating every room. "The sick ting is that the Emperor and his right hand man were both extremely powerful Force users. But Dark side. Sith. They hunted down and killed all the others."

Vader killed them. Vader was the nightmare that haunted the few surviving Jedi for decades.

"I know of one other potential Force user but she's not really interested in learning."