"Corridors of darkness, eh? Sounds like a very efficient means of transportation. So, you've tried entering a corridor but haven't been able to use it to get to any world you've attempted to navigate to? You've actually tried this while on the train?"

He nods, though the expression on his face is just slightly tinged with alarm. "Heartless are made of the darkness in people's hearts? Good thing we didn't have that sort of creature in my world. Too many hearts there that were filled with darkness, and we didn't need any dire magic that multiplied that darkness." Curufin's heart had been touch by darkness, beginning in childhood and becoming more blatant once he and his relatives had emigrated to Middle-earth. Six hundred years after the exodus, he had figured out how to mitigate that darkness and to choose a new path for himself.

"Was your world destroyed by these creatures, or some world you knew of?"