The Slender Man Mythos is the Mythos which The Fear Mythos was originally an off-shoot of. There aren't many major differences between the two mythoi, with the main one being that stories in the Slender Man Mythos center exclusively around The Slender Man with a few exceptions, the most noteworthy being EverymanHYBRID, which also features The Rake and its own character, HABIT.
The beginnings of the Mythos can be traced back to June 2009, when Victor Surge created and posted the first pictures of the Slender Man on the Something Awful forums. Since then, its popularity has skyrocketed and it has spread through the internet and pop culture, especially after the release of the game Slender: The Eight Pages.
Soon after Slender Man was created, the hit internet series Marble Hornets was released on YouTube, which was instrumental in codifying countless elements used in the Slender Man Mythos. Other big Slendervlogs include EverymanHYBRID, TribeTwelve, MLAnderson0, DarkHarvest00, and CaughtNotSleeping.
Following Marble Hornets, a blog known as Just Another Fool began. It was the very first Slenderblog and it started the trend. Other big Slenderblogs include Seeking Truth / The Mystic, Dreams in Darkness, White Elephants, The Tutorial, and CANYOUSEETHEWORDS (a blog connected to the EMH series).
The Slender Man Mythos also includes several amateur films and multiple popular independent games.
- The Slender Man Wiki - A fan made wiki that features more in-depth articles concerning series and concepts pertaining to the Slender Man Mythos. It has since branched off into various subsidiary wikis.
- Encyclopedia Slenderia - A now defunct informational blog by Omega that contains large amounts of information on Slender Man Mythos canon, especially in regards to early installments in the blogosphere.