"I don't know that much about how naturally occuring demons do it because I haven't met any new ones," says Cam. "In my case I was recently dead and had twenty-two years of knowledge of stuff-that-existed to use. I think it may be that naturally occurring demons can make themselves air and water and some basic food instinctively."
"Makes sense, just, not quiiite what I was thinking. I meant more-" she stops to think. "You asked for the make and model of your empathy blocker, earlier. Did you already know before you-" won't say died, it seems too weird when he is standing there "-became a demon that you needed that much detail? Or did you try to make things with less detail and fail? Or do you just... know somehow... that that's how much detail you need to know before it works?"
"Mmm... well, I knew a few things about how demon magic worked before, I'd met demons and asked them questions," says Cam. "And then I experimented some when I had the magic myself."
"No one knows on my world except the people who are already dead, and maybe some handful of summoners whose summons told them who have not shared the news. I probably would have told someone before but no one lets me talk when they summon me."
"Well, they're kind of afraid I will talk them into trading me their souls."
"Um. Seriously? Not one person has been cocky enough to assume they'll- I dunno, be able to send you back instead of giving you their soul, you said sending back is a thing- and had a whole 'okay five minutes later he is friendly and prone to handing out sweets' experience and decided you were safe? That sucks."
"I mean, I am an unusually nice demon and you are very lucky you got me."