Per 
Item #: SCP-XXXX
Object Class: Keter
Special Containment Procedures: [Paragraphs explaining the procedures]
Description: SCP-XXXX, when in his normal form, stands at a height of approximately 3.3 meters. XXXX is a collection of dust, gasses, and airborne chemicals mixed into a sentient humanoid shape with a dark crimson hue. XXXX seems to be abe to break shape and assume any other form it would like to. The SCP has assumed hundreds of forms since it was captured, ranging from a wall of pure chlorine gas to a mimic of another SCP, which it confronted. Strangely, this SCP seems to attack other SCPs rather than humans.
Addendum: Below is a list of times SCP-XXXX has breached containment for varying reasons.
Instance One: SCP discovered a small hole in the wall of its containment. XXXX slipped through the hole before resuming its human shape. It proceeded to wander around the facility before it encountered officer ████████. The officer was startled and reached for his weapon. SCP-XXXX quickly broke it's form into that of a black fog on the floor, moving at incredibly speed back to it's containment and slipping back inside. The containment was examined in depth and the hole was sealed.
Instance Two: SCP-████ had breached contaiment at approximately 4:00 P.M. and was rampaging throughout the facility. At the time of 4:42 P.M. it had killed ██ personnel, had sustained minor injuries, and was positioned outside the containment of SCP-XXXX. Security cameras within XXXX's containment showed it ramming up against the air-tight door in an attempt to break it down. With each impact it would break apart, appearing again approximately a meter away and smashing into the door again. After around a minute of this, a tear appeared on the door. Security cameras outside recorded SCP-XXXX fire itself through the crack, slamming into SCP-████, pushing it up against a wall with enough force to crack the concrete. SCP-████ had begun to swat at SCP-XXXX to no avail. XXXX broke away from it's combatant, forming into a perfect mimic of SCP-████ a few meters away. The two had fought for approximately 31 minutes before their location was hit with nerve gas in an attempt to either drive them off, incapacitate, or kill them. SCP-XXXX displayed its ability to take in chemicals for the first time when it mixed with the nerve gas, becoming more powerful and lethal than before. It grabbed onto SCP-████, slamming it against a wall several times, before melting over it. XXXX proceeded to expel the nerve gas it had gathered before slipping back into its containment and sitting in a corner. The nerve gas was cleared from the area before an MTF team entered. SCP-████'s body was found to be alive, but unconcious and in critical condition. SCP-████ was returned to containment and made a full recovery. Both SCP's containments were evaluated and improved after these incidents.
Experiments: Below is a list of experiments that started after SCP-XXXX's second containment breach.
Test One: Date - 3/12/20██
Label: Reaction to humans and aggression.
Participants: Class D, Jim Willows, guilty of 3 counts of murder. Class D, William Pollock, guilty of 2 counts of rape.
Dr. ███████: Enter the room.
//The sound of the air tight door opening can be heard, followed by footsteps. Afterwards, the sound of the door sealing back up again are heard.//
Willows: What the hell is that?
Dr. ███████: Don't worry about what it is. Go closer to it.
// After a moment of clear reluctance, foot steps can be heard, before being interrupted by Dr. ███████'s voice.//
Dr. ███████: Not both of you, just Willows.
//One set of foot steps continue for a few seconds.
Willows: Okay.. I'm right up on it now.. it's looking at me. That's all it's doing.
Dr. ███████: Good, good. Touch it.
Willows: You want me to touch this thing? What if it kills me?
Dr. ███████: The odds of the subject killing you for touching it are low. It's fled from personnel
before. Touch it, we are on a limited time frame.
Willows: But I.. ugh...
// I light humming sound is made as Willows presses his hand into SCP-XXXX. //
Dr. ███████: The SCP is showing no signs of aggression or agitation. How does it feel?
Willows: It feels.. kind of nasty. Sort of like I'm sticking my hand into a full vacuum cleaner bag.
Dr. ███████: Good. Remove your hand and then proceed to strike the subject with your fist.
Willows: You want me to attack it?
Pollock: Yo, if it kills him for that what if it comes for me, too?
Dr. ███████: We've come to the conclusion already that it can't be physically harmed. We want to see if your arm gets stuck within it or if your arm will simply pass through unphased. If it does react, it likely will be to retreat away from you.
// Willows removes his arm, sighing lightly as he balls his fingers into a fist, striking it against the midsection of the SCP-XXXX. SCP-XXXX quickly melts down into a small cloud of red smoke on the floor.//
Pollock: It.. shrunk? It melted. Doc, I think it's docile, can we get out of here now?
Willows: Yeah I.. I think it just wants to be left alo-
// Willows is interrupted as SCP-XXXX fires itself up from the ground, resuming its humanoid form, but holding him up by the throat with both hands. Willow's screams can be heard as he chokes out words. //
Willows: O-Oh fu- ghh! Stop it, sto- ggh.. get it off of me!
Pollock: O-Oh no, oh shit! Let me out of here!
// The sound of fists pounding against a metal door can be heard as Pollock attempts to force his way out. Willows's screams turn to terrible coughing as SCP-XXXX flows into his eyes, nose, and mouth. SCP-XXXX drops Willows, turning to face Pollock. Pollock can be heard screaming as SCP-XXXX charged into him, tackling him to the floor with a loud thud. //
Pollock: No! No! Please, no! Get off of me!
// SCP-XXXX places its hands onto Pollock's face, beginning to flow itself into him in the same way it did with Willows. //
Pollock: No! I'm sorry! I di-ghh... do anything! Don't ki-ghh.. me!
// XXXX stops, retracting itself out of Pollock. It retreats back off of him and into a corner. Pollock can be heard choking, crying, and coughing as he curls into a ball on the floor. //
Dr. ███████: That should be enough. The experiment was a success, end the recording.
Notes: Both D-Class personnel survived. Pollock had contracted a light cough, and Willows had developed lung cancer.
