Darlington laughs as well, like it's a joke. Is it a joke? He still doesn't know all the rules, but that seems like the safest assumption.

"You use the Ars Goetia?" He's read the Lesser Key of Solomon. Mostly rubbish, so far as he can tell. Skull & Bones uses bits of it in some of their prognostication, but it's nothing on the level of binding demons. Nothing from the Ars Goetia. "And it works? Where do you do your binding?"