Scp 106 (The old man)

Scp 106 (The old man) : SCP-106 is an elderly humanoid entity that appears to be in an advanced state of decay. Its body constantly releases a corrosive black substance capable of breaking down nearly any material. SCP-106 can pass through walls, floors, ceilings, and reinforced steel as if they do not exist. Unlike most hostile anomalies, SCP-106 does not rush its victims. It prefers to stalk them, observing from a distance before slowly approaching. Many personnel report feelings of dread and paranoia moments before encountering the entity.