Ok so before we get all the thats fake and made up its not real comments, let me explain why this question can be legit. A thought form, there is so much fear, energy, and belief put into the idea and concept of our good friend slendy that he was given a spiritaul presence. As the concept of slenderman is said to gain strength off fear, this thought form gains strength from the many videos and websites dedicated to it.
By: WhiteRav3n / Knowledgeable Aug 15, 2012
Post # 3
Slenderman does not exist. It was made up for a contest to create the scariest monster.
The real deal is der grossman. A German "boogeyman" of sorts that dwells/ed in dark forests (particularly the Black Forest) and is basically a bad tempered psychopomp that has a side talent of driving people insane, much like the furies were known to. The rise of the fictitious slenderman seems to have brought der grossman back into people's minds.
If you have a problem with something like der grossman, I would suggest trying a banishment and strong protection. Iron is an age old protection against most malevolent spirits. Der Grossman in particular is believed to be a nature spirit, so I would personally ask Morrigan for aid, since she is queen of fae.