The Grey Man is based off of Slenderman, a fictional supernatural character that originated as a creepypasta.
The Grey Man appears as a large man with no face and pale white skin. He wears a tuxedo and has large animated tentacles on his back. The Grey Man's ability is his only method of attacking. He is only visible whenever he uses his ability. Of all the slashers, this one is probably the scariest. He builds terror in you when you hear his ambience, and his attack is no less than a horrifying jumpscare. He also costs a whopping 500 points.
The Grey Man is always cloaked until he uses his ability. His ability uncloaks him briefly while also immobilizing him. His ability will damage survivors whenever it is used near them, and after a while you will re-cloak.