User can do demon things

Pros:
-user has no limit with flying
-user can make wounds worse
-user can talk to Satan any time and not look crazy
-Satan I'd happy to help them with anything
-user can make people go to hell by the click of their fingers, sinner or not

Cons:
-user must hide wings when not using them
-user can only make wounds worse
-user can't do anything about sins, only sense them

Weakness: angel
User will weaken in the presence of angels and gain a more demonic appearance