Your camping with a group. They aren't exactly your friends but they invited you nonetheless. You kept to yourself as the moon soon rose. And with it, the Proxies of Slenderman and his forest seemed out your camp group and killed them all except for you.

Make your move, and your story. Die or live on in the mansion, if they give you a chance. Becareful the creepypastas are just as dangerous as the proxies.