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The Slender Man boss wears a black coat, a blood red tie, and a faceless head, with blood on its hands. Since the 10.5.0 update, it is much taller than the Slender Zombie and has six tentacles that are sprouted from its back.
Slender Man will walk near the player, dealing damage. Since the 10.5.0 update, its six tentacles will curve toward the player as it approaches. In the same update, it has also gained the ability to teleport, allowing it to effectively surprise and attack the player from behind.
- His appearance is a direct note to the Slender Man character created by Something Awful users.
- It is the only boss other than The Bug that has the ability to teleport.
- This is the only boss who attacks in milliseconds because the tentacles also do damage.
- Although he is slow, his teleportation allow him to cover some distance very fast.
- He is capable of killing a low-level players in iron armour in a single shot, as his tentacles help him do extreme damage.
- This boss has one of the highest damage per second in the game.