A demon who makes deals with humans, they make a deal with whatever the human desires then make their side of the deal. However the demons don’t tell their side of the deal. When the deal for the human is done, they can hypnotize, or harm the human, maybe even torture them or just torment / annoy the human for the rest of their life. The demon avoids a lot of questions, the demon can also trick / hypnotize people into Shaking the demon hands with or without a deal.