[He nods, as though that doesn't surprise him.]

Yeah, I met someone a couple years ago who said he could do something similar to what I do. His could go between worlds, which mine definitely can't do. I think he called it a Corridor of Darkness.

[The details of that conversation are very fuzzy, but at least he remembers the important stuff!]

If you think it's worth it, then I'm not going to stop you from learning, especially if it comes in handy later.