"Slender man also sounds like a demon that takes children and offers them to the devil. I can't remember it's name, and I can't find it online. If he is then you could iron, but that would piss him off. He would come back. You could lay down a devils trap the say a banishment spell that would lock him in hell, but you need to know how to announce latin. If he is a wenigo he could be killed with iron, but fire is a lot better. "

"a Slenderman is kinda like a Wendigo. but its more powerful. maybe its Alpha was abused and beaten by Iron Chains so iron rounds should kill it "