Item #: SCP-049
Object Class: Euclid
Special Containment Procedures: SCP-049 is to be contained in a secure holding cell in Research Sector-██. SCP-049 is not to be removed from its cell unless approved by a Level Two or higher personnel, before which SCP-049 must be heavily sedated. Even so, at such times SCP-049 is to be accompanied by two (2) armed guards and guided by an iron collar, secured to two (2) iron poles 2 m in length, and held firmly by two (2) Level One or higher personnel while in transit. Any experiments performed on SCP-049 are to be conducted inside of specifically prepared rooms (see document 042-D-3-18).
SCP-049’s cell should be monitored at all times via a security camera. Should any abnormal behavior occur, Doctor ████ is to be alerted at once.
Description: SCP-049 is humanoid in appearance, standing at 1.9 m tall and weighing 95.3 kg; however, the Foundation is currently incapable of studying its face and body more fully, as it is covered in what appears to be the garb of the traditional “Plague Doctor” from 15-16th century Europe. This material is actually a part of SCP-049’s body, as microscopic and genetic testing show it to be similar in structure to muscle, although it feels much like rough leather, and the mask much like ceramic. It was originally discovered in ██████, England, by local police. Mobile task force [REDACTED] responded to a suspected outbreak of [DATA EXPUNGED]. All civilians within a .5km radius were given class A amnestics as part of the initial containment procedure.
SCP-049 does not speak (See addendum A-1), although it seems to understand English perfectly well, and is completely docile until it tries to perform surgery. SCP-049’s touch is invariably lethal to humans. After contact with SCP-049’s hand(s), the victim (hereafter referred to as SCP-049-2) suffers [DATA EXPUNGED] and dies within moments. SCP-049 will then attempt to kill all humans it can see in a similar manner, supposedly to avoid interruption, before returning to SCP-049-2. It produces a bag made of [DATA EXPUNGED] containing scalpels, needle, thread, and several vials of an as-yet-unidentified substance, from somewhere within its body (research has been unable to locate these tools when inside of SCP-049 through X-ray and similar techniques) and begins dissecting SCP-049-2, as well as inserting various chemicals into the body. After approximately 20 minutes, SCP-049 will sew SCP-049-2 back up and become docile once more.
After a period of a few minutes, SCP-049-2 will resume vital signs and appears to reanimate. However, SCP-049-2 seems completely without higher brain functions, and will wander aimlessly until it encounters another living human. At that point, SCP-049-2's adrenaline and endorphin levels increase to approximately three-hundred (300) percent as it attempts to kill and ██████ any human beings it can find, before returning to its mindless state and wandering until it comes across more humans. At this stage, termination with extreme prejudice is allowed. Failure to enforce this protocol outside of testing scenarios (see addendum T-049-12) is punishable by termination.
Detailed autopsies of SCP-049-2 have found several unusual substances (along with usual substances in large amounts) within the bodies, including [DATA EXPUNGED]. However, several have yet to be identified (researchers with level 3 or higher authorization, refer to Addendum C-1).
Addendum A-1: SCP-049 spoke for the first time today, 12-6-20██, addressing Dr. ████. A full account of the conversation is attached.
Interviewer: Doctor ███████ ████
Foreword: SCP-049 randomly began speaking with no obvious provocation en route to a testing facility. Doctor ████ was recording notes at the time on a handheld microphone. Irrelevant data has been omitted.
Closing Statement: “We managed to get our tests done for that day, trying to figure out what causes it to perform surgery, or, more accurately, what it detects as the 'Pestilence’. So far, research has shown us no correlation between any of the D-class personnel it has performed surgery on. We’re still working on it."
SCP-049: “What is this place?"
Dr. ████: “What? It’s a labo…” [There is a loud crash here, from Doctor ████ dropping the recording device in shock.]
SCP-049: “A laboratory? It is quite marvelous. I now find it no wonder I’ve seen so few victims of the disease in here.”
Dr. ████: “Y…eah. You see, I'd thought you incapable of speech. I’m somewhat startled you, um, can.”
SCP-049: “Oh, my, yes, good sir. I simply prefer not to. Most victims of the disease are quite melancholy and do not react at all well to conversation. I have seen you several times now, and have not detected the disease in you, therefore I assume you are also a doctor?”
Dr. ████: “Yes, actually. Call me [REDACTED]… but, what ‘disease’ are you talking about?”
SCP-049: “Why, good doctor, the Great Pestilence. What else?”
Dr. ████: “Great pesti… Oh, the Plague. Should have seen that coming. But, no one here is infected, I can assure you.”
SCP-049: “Oh, good doctor, I can assure you, the Pestilence is here, and I can sense it. It is my duty in life to rid the world of it. My cure is most effective.”
Dr. ████: “Your cure? Your cure has cost us hundreds of lives! Your cure is faulty!"
SCP-049: “Good doctor, my cure is most effective.”
[SCP-049 lapsed once again into silence, and no further attempts to make it speak were effective.]
Item #: SCP-096
Object Class: Euclid
Special Containment Procedures: SCP-096 is to be contained in its cell, a 5 m x 5 m x 5 m airtight steel cube, at all times. Weekly checks for any cracks or holes are mandatory. There are to be absolutely no video surveillance or optical tools of any kind inside SCP-096's cell. Security personnel will use pre-installed pressure sensors and laser detectors to ensure SCP-096's presence inside the cell.
Any and all photos, video, or recordings of SCP-096's likeness are strictly forbidden without approval from Dr. ███ and O5-█.
Description: SCP-096 is a humanoid creature measuring approximately 2.38 meters in height. Subject shows very little muscle mass, with preliminary analysis of body mass suggesting mild malnutrition. Arms are grossly out of proportion with the rest of the subject's body, with an approximate length of 1.5 meters each. Skin is mostly devoid of pigmentation, with no sign of any body hair.
SCP-096's jaw can open to four (4) times the norm of an average human. Other facial features remain similar to an average human, with the exception of the eyes, which are also devoid of pigmentation. It is not yet known whether SCP-096 is blind or not. It shows no signs of any higher brain functions, and is not considered to be sapient.
SCP-096 is normally extremely docile, with pressure sensors inside its cell indicating it spends most of the day pacing by the eastern wall. However, when someone views SCP-096's face, whether it be directly, via video recording, or even a photograph, it will enter a stage of considerable emotional distress. SCP-096 will cover its face with its hands and begin screaming, crying, and babbling incoherently. Approximately one (1) to two (2) minutes after the first viewing, SCP-096 will begin running to the person who viewed its face (who will from this point on be referred to as SCP-096-1).
Documented speeds have varied from thirty-five (35) km/h to ███ km/h, and seems to depend on distance from SCP-096-1. At this point, no known material or method can impede SCP-096's progress. The actual position of SCP-096-1 does not seem to affect SCP-096's response; it seems to have an innate sense of SCP-096-1's location. Note: This reaction does not occur when viewing artistic depictions.
Upon arriving at SCP-096-1's location, SCP-096 will proceed to kill and [DATA EXPUNGED] SCP-096-1. 100% of cases have left no traces of SCP-096-1. SCP-096 will then sit down for several minutes before regaining its composure and becoming docile once again. It will then attempt to make its way back to its natural habitat, [DATA REDACTED]
Due to the possibility of a mass chain reaction, including breach of Foundation secrecy and large civilian loss of life, retrieval of subject should be considered Alpha priority.
Dr. ███ has also petitioned for immediate termination of SCP-096 (see Interview 096-1). Order is awaiting approval. Termination order has been approved, and is to be carried out by Dr. ███ on [DATA REDACTED].
Audio log from Interview 096-1:
Interviewer: Dr. ███
Interviewed: Captain (Ret.) █████████, former commander of retrieval team Zulu 9-A
Retrieval Incident #096-1-A
[████████ ████████ Time, Research Area ██]
Capt. █████████: It always sucks ass to get Initial Retrieval duty. You have no idea what the damn thing is capable of besides what jacked up information the field techies can scrape up, and you're lucky if they even tell you the whole story. They told us to "bag and tag." Didn't tell us jackshit about not looking at the damn thing.
Dr. ███: Could you describe the mission, please?
Capt. █████████: Yeah, sorry. We had two choppers, one with my team and one on backup with Zulu 9-B and Dr. ██████. We spotted the target about two clicks north of our patrol path. I'm guessing he wasn't facing our direction, else he would have taken us out then and there.
Dr. ███: Your report says SCP-096 didn't react to the cold? It was -██o C.
Capt. █████████: Actually, it was -██. And yes, it was butt naked and didn't so much as shiver. Anyway, we landed, approached the target, and Corporal ██ got ready to bag it. That's when Dr. ██████ called. I turned to answer it, and that's what saved me. The target must have turned and my whole squad saw it.
Dr. ███: That's when SCP-096 entered an agitated emotional state?
Capt. █████████: Yep. [Interviewed now pauses for a second before continuing] Sorry. Got the willies for a second.
Dr. ███: That's all right.
Capt. █████████: Yeah. Well, I never saw its face. My squad did, and they paid for it up the ass.
Dr. ███: Could you describe it a little more, please?
Capt. █████████: [Pauses] Yeah, yeah. It started screaming at us, and crying. Not animal roaring though, sounded exactly like a person. Really fucking creepy. [Pauses again] We started firing when it picked up Corporal ██ and ripped off his leg. God, he was screaming for our help… fuckin 'A… anyway, we were blowing chunks out of the target, round after round. Didn't do jackshit. I almost lost it when it started [DATA EXPUNGED] him.
Dr. ███: That's when you ordered the use of an [Papers are heard moving] AT-4 HEDT launcher?
Capt. █████████: An anti-tank gun. Started carrying it ever since SCP-███ got loose. I've seen those tear through tanks like tissue paper. Did the same thing to the target.
Dr. ███: There was significant damage to SCP-096?
Capt. █████████: It didn't even fucking flinch. It kept tearing apart my squad, but with half of its torso gone. [He draws a large half-circle across his torso]
Dr. ███: But it was taking damage?
Capt. █████████: If it was, it wasn't showing it. It must have lost all its organs, all its blood, but it didn't acknowledge any of it. Its bone structure wasn't hurt at all, though. It kept tearing my squad apart.
Dr. ███: So no actual structural damage. How many rounds would you say were fired at SCP-096?
Capt. █████████: At the least? A thousand. Our door gunner kept his GAU-19 on it for at least twenty seconds. Twenty fucking seconds. That's six hundred .50 caliber rounds pumped into the thing. Might as well been spitting at it.
Dr. ███: This is when Zulu 9-B arrived?
Capt. █████████: Yeah, and my squad was gone. Zulu 9-B managed to get the bag over its head, and it just sat down. We got it into the chopper and got it here. I don't know how I never saw its face. Maybe God or Buddha or whoever thought I should live. The jackass.
Dr. ███: We have obtained an artist's depiction of SCP-096's face. Would you like to view it?
Capt. █████████: [Pauses] You know, after hearing that thing's screams, and the screams of my men, I don't think I want to put a face to what I heard. No. Just… no.
Dr. ███: All right, I believe we are done here. Thank you, Captain.
[Chairs are heard moving, and footsteps leave the room. Captain (Ret.) █████████ is confirmed to have left Interview Room 22.]
Dr. ███: Let this be on record that I am formally requesting SCP-096 be terminated as soon as possible.
Item #: SCP-682
Object Class: Keter
Special Containment Procedures: SCP-682 must be destroyed as soon as possible. At this time, no means available to SCP teams are capable of destroying SCP-682, only able to cause massive physical damage. SCP-682 should be contained within a 5 m x 5 m x 5 m chamber with 25 cm reinforced acid-resistant steel plate lining all inside surfaces. The containment chamber should be filled with hydrochloric acid until SCP-682 is submerged and incapacitated. Any attempts of SCP-682 to move, speak, or breach containment should be reacted to quickly and with full force as called for by the circumstances.
Personnel are forbidden to speak to SCP-682, for fear of provoking a rage-state. All unauthorized personnel attempting to communicate to SCP-682 will be restrained and removed by force.
Due to its frequent attempts at containment breach, difficulty of containment and incapacitation, and high threat of Foundation Exposure, SCP-682 is to be contained in site [REDACTED]. The Foundation will use the best of its resources to maintain all land within fifty (50) kilometers clear of human development.
Description: SCP-682 is a large, vaguely reptile-like creature of unknown origin. It appears to be extremely intelligent, and was observed to engage in complex communication with SCP-079 during their limited time of exposure. SCP-682 appears to have a hatred of all life, which has been expressed in several interviews during containment. (See Addendum 682-B).
SCP-682 has always been observed to have extremely high strength, speed, and reflexes, though exact levels vary with its form. SCP-682's physical body grows and changes very quickly, growing or decreasing in size as it consumes or sheds material. SCP-682 gains energy from anything it ingests, organic or inorganic. Digestion seems to be aided by a set of filtering gills inside of SCP-682's nostrils, which are able to remove usable matter from any liquid solution, enabling it to constantly regenerate from the acid it is contained in. SCP-682's regenerative capabilities and resilience are staggering, and SCP-682 has been seen moving and speaking with its body 87% destroyed or rotted.
In case of containment breach, SCP-682 is to be tracked and re-captured by all available Mobile Task Forces, and no teams with fewer than seven (7) members are cleared to engage it. To date (██-██-████), attempted breaches have numbered at seventeen (17), while successful breaches have numbered at six (6). (See Addendum 682-D).
Addendum 682-B: Portion of recorded transcript of ██████.
<Begin Log, skip to 00h-21m-52s>
Dr. ██████: Now, why did you kill those farmers?
SCP-682: (No verbal communication)
Dr. ██████: If you don't talk now, we will remove you from this attempt and place you back into-
Dr. ██████: Pardon? (Motions to move microphone closer)
Dr. ██████: Speak up. (To Personnel D-085) Move the mic up closer.
SCP-682: …they were (Incomprehensible)…
Dr. ██████: (To Personnel D-085) That microphone has only so much gain, move it closer to it!
Personnel D-085: His throat's messed up man, look at it! He ain't talking- (Gasps and screams)
SCP-682: (Appearing to assault D-085's body) …they were… disgusting…
Dr. ██████: (Retreats from the room)
Addendum 682-E: Termination Options:
Log of event 682-E18: Dr. █████ attempts to use SCP-409 on SCP-682. General ███, General ██████, and Dr. ██████████ observing.
0400: Exposure. SCP-682 began to tear at the point of contact, causing massive trauma to the area. SCP-682 requests several times to know what it has been exposed to.
0800: Crystallization begins, spreading much slower than normal.
1200: SCP-682 shows signs of extreme pain, and begins having seizures
1300: Crystallization stops at 62% conversion. Crystallized area explodes, causing massive physical trauma to SCP-682
1400: SCP-682 recovers from exposure, despite the loss of limbs and organs. SCP-682 begins regeneration, stating that it will attempt to kill and consume all staff involved in Event 682-E18.
SCP-682 appears to now be immune to SCP-409 Use of other SCP items to terminate SCP-682 must now first be tested on samples of SCP-682 before full-scale testing.
In accordance the Dr. ████████'s recommendations (see Document 27b-6), Dr. ███████ and Dr. █████ have requested permission to attempt the termination of SCP-682 using SCP-689. The request is currently pending approval from the ████████.
It has also been suggested by Dr. Gears to use SCP-182 in an attempt to communicate with SCP-682. SCP-182 has expressed reluctance, and refuses to enter the containment center of SCP-682, if at all possible.
(A/N): My favorite SCP of all time, and boy did I go all out with this one! I started working on this since 11:00 this morning. It took me FIVE HOURS to completely finish this vector (hey, that's half the time I spent making the first version of this one! Record breaking progress!), and I am super proud with the results.
I also want to give a big thank you to for creating a line art design for me to take reference for this vector after! Let's give a big hand for his/her contribution to this vector! And if you want to see more of his/her work, check out his/her page here: dragonwolf1775.deviantart.com/
Item #: SCP-457
Object Class: Euclid/Potential Keter
Special Containment Procedures: SCP-457 is to be kept in a 5m x 5m chamber with no less than 22.9cm (9in) of cumulative fireproofing via various materials (asbestos cement, perlite boards) upon all surfaces and a blast-proof observation window with emergency blast shielding installed. The opening to the chamber must consist of at least two temperature-controlled and airtight chambers that may be sealed in case of emergency. SCP-457's chamber should be kept at high humidity with a drainage system installed in the floor, as well as a misting sprinkler system installed and running constantly, and emergency hoses capable of at least 2.1 MPa (300 psi) of water pressure. SCP-457 is allowed a small structure upon the wall of its chamber that remains water-free, but only allows for minimal protection and preservation of form.
All personnel entering SCP-457's chamber should be wearing at least Class-A temperature-controlled, flame-retardant sealed suits, and enter in groups of three, with two members equipped with high-grade blast shields and emergency fire extinguishers. Personnel should only enter SCP-457's chamber in order to supply SCP-457 with its daily allotment of fuel material, or to examine and repair any damage to the chamber or sprinkler systems.
Should SCP-457 engage personnel in a hostile manner, it is to be controlled via emergency extinguishers and hoses until it retreats back to its safe chamber.
In the event that SCP-457 breaks containment, emergency sprinkler systems will be triggered and personnel will be supplied with extinguishers and blast shielding.
Description: For all points and purposes, SCP-457 appears to be a sentient being composed of flame. SCP-457's actual composition is unknown, and has proven to be invisible and undetectable by any known means, but is shaped out by the flames it produces, often assuming a human-like form if given sufficient fuel to assume that size. SCP-457's most rudimentary form appears to be that of a single flame, comparable in size to that of a matchstick. In this form, SCP-457 possesses only the simplest of directives and shows no signs of being unusual compared to any other flame beyond a penchant for suddenly flickering to burn human hands, and the ability to 'jump' to more flammable materials or other flames, which it then assimilates into its total form.
As SCP-457 grows larger, it is able to assume more complex shapes, and its intelligence grows with size and fuel sources. SCP-457's method of intelligence is unknown, but upon reaching an approximately human size, SCP-457 almost always assumes a human-like form surrounded by and composed of flames. SCP-457 has been observed to communicate through writing letters out of its own flames, charring them onto the wall or other surfaces, and more rarely through speech, created via high-pressure, superheated air and the crackling and pops of flames. Once SCP-457 reaches an unknown threshold of size and fuel source, SCP-457 splits into two beings, and so on so forth. However, multiple beings of SCP-457 are aggressive towards each other, and will either attempt to consume or extinguish their doubles, especially if there is only a limited amount of fuel at hand.
SCP-457's behavior is largely predictable, as its goals are simply to acquire larger sources of fuel and to spread. The danger of SCP-457 comes from its ability to increase intelligence with size, and apparent ability to learn and mimic behaviors. This has lead to it purposely damaging and sabotaging sprinkler systems and, in rare circumstances, set up relatively complex traps. It has also attempted to trick or reason with personnel to be released or have access to more fuel. Due to SCP-457's unique composition, variable intelligence, and uncooperative nature, its psychology may not be accurately determined in accordance with any human analogy.
SCP-457 was recovered in ██████, █████ in the summer of 2007, after multiple wildfires were attributed to it. It is unknown where or how SCP-457 initially formed. Investigation into the potential of SCP-457 being responsible for other major fires is underway.
An Interview between Doctor ████ and SCP-457
Dr. ████: Can you speak, currently?
Dr. ████: Good. Would you mind answering some questions?
SCP-457: [[No reply]]
Dr. ████: I'll take that as a no. How do you feel about being confined?
SCP-457: [[Crackling]] Dislike. No fuel. No air.
Dr. ████: We have provided you with adequate air and fuel to survive.
SCP-457: Can not burn. No fuel.
Dr. ████: Are you saying that you cannot grow?
SCP-457: Grow. Need. Must grow. [[457 moves about containment area as if searching]]
Dr. ████: How do you feel?
Dr. ████: Do you feel anything besides hunger?
SCP-457: [[No answer, 457 approaches blast shielding separating it from Dr. ████]]
Dr. ████: How do you feel about humans?
SCP-457: They burn. [[457 moves closer to blast shielding, appearing to examine the window and Dr. ████]]
Dr. ████: How do you feel about fuel?
SCP-457: It burns. [[457 places a 'hand' upon the blast shielding to no effect]]
Dr. ████: Please move away from the window. Or we will be forced to reduce your size considerably.
SCP-457: [[No reply or signs of understanding. Does not move.]]
Dr. ████: …How do you feel about water?
SCP-457: [[Emits a high-pitched scream of superheated air and presses body against blast shielding.]]
Dr. ████: Please move away from the window, or we will be forced to turn the sprinklers back on.
SCP-457: [[Backs away from the window, still screaming, hissing, and snapping.]]
Dr. ████: Do you understand that? Stay away from the window, and you will not be doused.
SCP-457: [[Quiets and remains still for several seconds before approaching window again, stopping several feet away.]]
Dr. ████: Do you understand?
SCP-457: Want fuel. Want air. Want burn. Want to burn. Want to burn. Want to burn. [[Repeats self, growing louder and beginning to move about containment area rapidly, apparently searching walls and ceiling for a way out]]
Dr. ████: There is not a way out, if you would please…what is it doing? Is it looking for a way ou-
[[At this point in the interview, SCP-457 managed to severely damage much of the sprinkler system and destroy a portion of the fuel injector that had been sustaining its intelligent form, giving it free access to several gallons of gasoline. The interview transcript was recovered via security footage from before the blast. SCP-457's temporary breach of containment came from an exploitation of the sealant used to attach the blast shielding to the rest of the chamber. How SCP-457 managed to learn of and exploit this weakness is unknown, and it has since been moved to a higher-security chamber.]]
Item #: SCP-939
Object Class: Keter
Special Containment Procedures: SCP-939-1, -3, -19, -53, -89, -96, -98, -99, and -109 are kept in Cell 1163-A or 1163-B, 10 m x 10 m x 3 m containment chambers within Armed Bio-Containment Area-14. Both cells are environmentally regulated and negatively pressurized, with walls constructed of reinforced concrete. Access to these cells is regulated by an outer decontamination chamber and inner gas-tight steel security doors. Observation windows are constructed of laminated ballistics glass 10 cm in thickness protected by a 100kV electrified mesh. Humidity is maintained at 100% at a temperature of 16° C. Specimens are monitored at all times via infrared cameras. Level Four authorization is required to access SCP-939, their containment areas, or the observation chambers.
SCP-939-101 is dismembered and stored in Cryogenic Preservation Tanks 939-101A to 939-101M within Bio-Research Area-12. Access to SCP-939-101 requires authorization by two Clearance Level 3 personnel, one of which must be present for all research and testing. The contents of only one (1) 939-101 tank may be accessed at any given time. Core temperature of SCP-939-101 tissues must be monitored while removed from cryogenic preservation; should core temperature exceed 10° C, tissues are to be returned to their corresponding tank and all testing suspended for a period of seventy-two (72) hours. Barring core temperature exceeding 10° C, research of SCP-939-101 tissues may continue as long as its ramblings and pleas for release may be tolerated.
Containment cells should be cleaned biweekly. While this takes place, SCP-939 specimens will be transferred to the adjacent cell. During this time, the cell's door and observation window must be inspected for damage and repaired or replaced accordingly.
Heavy sedation of all SCP-939 is required before any interaction, including transfer between cells and experimentation, may take place. See Document #939-TE4 for transfer and experimentation protocol.
Level C Hazmat gear is to be worn by personnel during interactions with SCP-939 specimens and in any areas which SCP-939 have been known to inhabit. Afterward, standard decontamination procedures are to be observed by all personnel involved to ensure no secondary spread of amnestic agents occurs.
Following Incident ABCA14-939-3, all non Class D personnel interacting with SCP-939 for any length of time are required to wear two (2) water-proof electronic pulse monitors for the duration of such interaction. These pulse monitors will transmit to a wireless monitoring system independent of a facility's main power grid, with at least one backup power system on standby. Should both an individual's pulse monitors flat-line or otherwise malfunction, the wearer will be presumed dead, personnel instructed to disregard all the wearer's subsequent vocalizations, and a breach of containment declared automatically. Security personnel responding to such a breach are likewise required to wear these pulse monitors.
Additionally, all live SCP-939 must be implanted with subdermal tracking devices upon capture.
Description: SCP-939 are endothermic, pack-based predators which display atrophy of various systems similar to troglobitic organisms. The skins of SCP-939 are highly permeable to moisture and translucent red, owing to a compound chemically similar to hemoglobin. SCP-939 average 2.2 meters tall standing upright and weigh an average of 250 kg, though weight is highly variable. Each of their four limbs end in three-fingered claws with a fourth, opposable digit, and are covered in setae which considerably augment climbing ability. Their heads are elongated, devoid of even vestigial eyes or eye sockets, and contain no brain casing. The jaws of SCP-939 are lined with red, faintly luminescent fang-like teeth, similar to those belonging to specimens of the genus Chauliodus, up to 6 cm in length, and encircled by heat-sensitive pit organs. Eye spots, sensitive to light and dark, run the length of their spined dorsal ridges. These spines may be up to 16 cm long and are believed to be sensitive to changes in air pressure and flow.
SCP-939 do not possess many vital organ systems; central and peripheral nervous systems, circulatory system, and digestive tract are all absent. SCP-939's respiratory system is atrophied and serves no apparent purpose beyond spreading AMN-C227 (see below). SCP-939 have no apparent physiological need to feed, nor any way to digest consumed tissue. Ingested material typically accumulates in the respiratory system of SCP-939 and is regurgitated once the amount is sufficient to markedly inhibit its function. Despite the absence of many vital organ systems, SCP-939 are capable of bearing live young. See Addendum 10-16-1991.
SCP-939's primary method of luring prey is the imitation of human speech in the voices of prior victims, though imitation of other species and active nocturnal hunts have been documented. SCP-939 vocalizations often imply significant distress; whether SCP-939 understand their vocalizations or are repeating previously heard phrases is the subject of ongoing study. How SCP-939 acquire voices is not currently understood; specimens have been documented imitating victims despite never hearing the victim speak. Analysis of SCP-939 vocalizations cannot distinguish between SCP-939 and samples of known victims' voices. The use of biometric voice-recognition security or identification systems at any installation housing SCP-939 is strongly discouraged for this reason. Prey is usually killed with a single bite to the cranium or neck; bite forces have been measured in excess of 35 MPa.
SCP-939 exhale minute traces of an aerosolized Class C amnestic, designated AMN-C227. AMN-C227 causes temporary anterograde amnesia, inhibiting memory formation for the duration of exposure, plus an average of thirty (30) minutes. It is colorless, odorless, and tasteless with an estimated ECt50 for inhalation of 0.0015mg•min/m3. In well-ventilated or open air environments, risk of exposure to ECt50 is greatly reduced but not negligible. AMN-C227 is typically undetectable in the bloodstream sixty (60) minutes following cessation of exposure. Reported sensations of disorientation and mild hallucinations immediately following removal from environments saturated with the agent are similar to recreational use of numerous psychoactive substances and easily mistaken as such.