Slender Man, the name used to be feared all over Remnant, even people like Ozpina and Salem both feared the name and still do, but many centuries ago he disappeared without a trace, when people knew of Slender Mans disappearance they still feared him and knew he would be back, however through the years many had forgotten about him and now when people hear the name Slender Man they think of the fictional character in books, but now Slender Man has come back and he has some friends with him RWBY is owned by Rooster Teeth