SCP-513-1

SCP-513 was recovered with a scrap of paper on it and the bell's clapper being taped down to one of the interior sides. The note read: "You've seen it. Now he can hear you. You've touched it. Now he can see you. Never ring it. If you hear it, he can touch you." It was revealed soon after that any individual that hears SCP-513 ring will instantly develop acute anxiety and paranoia. They begin feeling as if they are being followed and watched. Approximately an hour after exposure, victims will begin to catch glimpses of SCP-513-1 out of the corners of their eyes, in mirrors, and/or opening doors. Upon being sighted, SCP-513-1 will reportedly flee the area.

Fears and anxieties begin to worsen as the victims are continually stalked, and if they should attempt sleep, they will be viciously attacked by SCP-513-1. Upon awakening, SCP-513-1 will flee again. The repeated exposure the stalking and attacks leads to serious deprivations in the victims' mental health, such as paranoia, aggression, sleep deprivation, depression, and hypervigilance, eventually ending with the subject committing suicide.

SCP-513 is kept within a soundproof gelatin block. Personnel stationed around the holding cell wear noise-dampening earmuffs and earplugs, and removal of SCP-513 is only to be performed by surgically deafened personnel. Victims exposed to SCP-513's ringing will not be allowed to sleep or fall unconscious. If the victim is Class-D personnel or falls asleep/unconscious, they will be terminated.

Processes are still underway to try and capture SCP-513-1.

Appearance
Descriptions of SCP-513-1's appearance vary based off of the subject, but most claim him to be a dark, skeletal humanoid with abnormally large hands. From the note found on SCP-513, it is known that it is male.

Personality
Little to nothing is known about SCP-513-1's personality or motivations. He is shown to be very patient, insightful, manipulative and calculating, driving those who heard SCP-513 insane. It is believed that his fleeing is not done out of cowardice or safety, but rather to more slowly and strategically damage the mental health of his victims. He is assumed to be sadomasochistic, malicious and insane.

SCP: Containment Breach
SCP-513-1 appears in the game after the player rings SCP-513. It simply stalks the player, appearing briefly before disappearing and breathing loudly. It simply serves as a fear and scaring mechanic. Destroying SCP-513 will make SCP-513-1 disappear.

SCP-513-1 was removed in version 1.0 and replaced with SCP-372 as the harmless fear mechanic.