Slenderman for Minecraft follows the same format as Slender and Slenderman i.e. you are stalked by a mythical figure called Slenderman who drains you psychically if you come into contact with him. However, in Slenderman for Minecraft, he appears very rarely - the developer claims the probability is about "3% per chunk, which is around 2-3 slendermen per biome."
Slenderman can teleport and appear and disappear randomly and in Slenderman for Minecraft, he can see you through all transparent surfaces. He can also break torches, glowstones, redstone torches and other light sources as well as open doors and trapdoors. You can however kill Slenderman in Slenderman for Minecraft with either a Diamond or Slender Sword.
The installation process for this Mod is a bit tricky for beginners and full instructions can be found on the developer homepage.
Slenderman for Minecraft will appeal to all Minecraft players that are big fans of Slender.