This article is a stub. You can help the Slender Fortress Wiki by expanding it.SCP-966 also known as The Sleep Killer is a boss on slender fortress
|Signs of nearing||Echoing moans and grunts|
|Origin||SCP: Containment Breach|
|Theme song||SCP-966 Theme|
SCP-966 is a monster that can only be seen through night vision or infrared devices, it looks like a tall lanky humanoid with an alien like face with a boney head, long sharp claws, greyish skin that looks like it is tightly wrapped on the entity and outstretched limbs, they are extremly slow in containment breach and takes up to 30 hits to kill the player and can appear anywhere in the facility after you encounter their containment cell.
In Slender Fortress Edit
SCP-996 is in Boss Pack 17. Unlike in Containment Breach it can infact be seen even with out the night vision, it is a lot faster than the original and it does 100 damage and freezes the player when they are hit. It isn't stunable.