Per 
SCP-4273, mid emergence
Clearance Level: 3
Item #: SCP-4273
Object Class: Keter
SCP-4273 is to be contained in a cell with little to no lights, making shadows not appear from figures such as humanoids. There is to be a wide space between the room outside of the cell, and the cell itself. Flashlights, or any sort of lighting utensil are not allowed in the cell, or anywhere near the cell.
SCP-4273 is not allowed near lights, as execution will be proceeded.
SCP-4273 can not be photographed, nor filmed on camera, as it will not show up.
Description: SCP-4273 is a black shadow like humanoid, and has white and black substances coming from his body. SCP-4273 is very quick, and tends to move around in his cell, and makes eye contact with the cameras often. SCP-4273 is capable of extending his fingers an extra 5 inches. When attacking, SCP-4273 will attempt to hide in the shadow of his prey and damaging major organs, muscle groups, or tendons, then wrap his hands around the neck of his prey, strangling them. When SCP-4273's victim is being strangled, he turns the victim's skin, black and flakey, making it fall off, then the organs will fall from the victim's body, because of the lack of skin holding it in place.
SCP-4273 causes a “disruption” in the victim's shadow when hiding in it. This means, that when SCP-4273 is hiding in a shadow, the shadow begins to sometimes "flicker" and become slightly darker. This disruption is not very noticeable.
SCP-4273 does not need to hide in a shadow to kill his prey, but when he has the opportunity, he does. That's because SCP-4273 has more strength while hiding in shadows. SCP-4273 can disappear or "teleport" for a short amount of time, when not in his containment cell. If SCP-49192 escapes, there is not much to do to try to execute him, as there is no possible way of now.
If SCP-4273 is acting strange, people below [O-3] are to call Dr. ████, and then back away from the cell, keeping it guarded until he arrives. SCP-4273 is also known as the "Shadow Stalker", that name coming from the way he kills his prey.
Addendum:
SCP Review Notes:
SCP-4273 is to be tested on by Class-D Personnel, every 2 months, as his behavior changes often. Physical restraints are impossible, and direct physical damage appears to have no effect on SCP-4273. SCP-4273 is to be held in Facility ██. SCP-4273 has seem to appeared "communicating" by using soft whispers, yet when Dr. ███ tried to interview SCP-4273 , he didn't talk.
Notes on behavior:
SCP-4273 usually is very hyper when in dark spots, which is dangerous because of the fact that he can not be trusted in areas with light. In one attack, SCP-4273 [DATA EXPUNGED] a Class-D Personnel, when there was no light. SCP-4273 will attack anyone around him, even other SCP's.
SCP-4273 seems to hate the human race, and will attack anyone when he has the chance. When SCP-4273 kills his prey, it looks as he would "stare" at the dead body for a short amount of time, then move on. SCP-4273 will tend to sometimes hide, or "disappear" around corners, and then making eye contact with his prey.
SCP-4273 will sometimes go into a state of insanity when in a very bright room, making him kill anyone instantly when in this stage.
