SCP-087-1, Villains Wiki

SCP-087-1 is a possible antagonist in the SCP Foundation series. It is a humanoid face that appears as some sort of paranormal entity in the eldritch staircase SCP-087. SCP-087 is a seemingly endless staircase, cloaked in darkness. Lights can be used, but light sources above 75 watts will prove ineffective, as SCP-087 seems to absorb excess light. It is unknown whether or not it is endless, though it is calculated to be deeper than the structure of the building it's in as well as the geological

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I found a clue to how mangle did the bite of 87! (SEE COMMENT) : r/FnafAr