"Anything mechanical, mostly. I know there's a few other things that are magically hidden in the city, but I don't know as much about them." He shrugs a little before turning to Ryoji. "And as far as I know, only by having a close encounter with something made by it. Which is terribly risky when you know what you're doing."

There's a puff of air in Ryoji's face. "So don't get any ideas."