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SCP-966 also known as The Sleep Killer is a boss on slender fortress

Intro None
Type Mob Chaser
Signs of nearing Echoing moans and grunts
Origin SCP: Containment Breach
Map(s) Containment Breach
Theme song SCP-966 Theme
Partners SCP-966 duplicates & SCP-173
Stunnable? No

Description Edit

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 extremely 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 the SCP Pack. 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 50 damage and freezes the player when they are killed. It isn't stunnable. As of the Festive Update SCP-966 will slow the player down when attacking.