The Damned camera senses the fiends in your area. With the Damned camera, all ghosts in your area will be unveiled. Move to a different area and you will be surprised to see what ghosts you can find.
When you get those ghosts, be brave and try and take a selfie with them. Share the fiend selfie with your friends if they do not believe you
If you want to go fiend hunting, buy the fiend radar and go chase them.