Creepypastas, Slashers, and Trevor Henderson monsters. You were always used as a lab rat your whole life until you snapped and killed them all burning the lab down. You can't age because of the tests and can heal very fast. (You can pick out a couple other abilities) you first met Slenderman who offered you to be a proxy. You didn't take it at first and he didn't push you but he gave you the offer incase you changed your mind. The other proxies weren't to happy about you being given a choice since they didn't get one but slender told them that you were stronger then you even know and could probably take slender down or even Zalgo if you learned how strong you really were.