Seleucus308
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Item #: SCP-XXXX

Object Class: Euclid

Special Containment Procedures: SCP-XXXX is to be kept in a containment room composed of seamless concrete on all surfaces, with the exception of (1) reinforced plexiglass window and (1) airlock-style entrance. The plexiglass window is to be at least four (4) centimeters thick, and will allow researchers in an adjacent observation room to safely observe the entity. The airlock-style entrance is to be composed of two (2) electronically locked, airtight steel doors integrated into the concrete wall, spaced two (2) meters apart. Any personnel entering the containment room cannot open the second door until the first door has secured behind them. The room should be illuminated at all times with one (1) 50-watt light bulb.

One (1) airtight door of the same specifications as the containment room doors must be at the entrance of the adjacent observation room, following the incident on ██/██/2005 detailed in the attached Containment Breach Report.

Description: SCP-XXXX is an entity of unknown origin which has the capability to exist in different states of matter at different times. It can be a gray, amorphous, gaseous entity; a humanoid resembling a human being from its recent memory; or varying levels of solidity in between those two states, in which some bone and organ structure can be seen suspended in the otherwise gaseous mass. Under normal conditions, this in-between state is by far the most common state exhibited by the entity. However, it is believed that all degrees of solidity in the entity are solely manipulations of itself for survival purposes in the presence of light. The humanoid state cannot be encountered except in the case of a containment breach.

Its humanoid state is known to be a replication of whichever human it has most recently had direct contact with. The only distinction between the entity in this state and the human that it is copying is the lack of color in the entity's copy. In all cases observed so far, it can only replicate the appearance and makeup of a human that it has directly encountered (and terminated) within the previous 24 days. This state has only ever been observed in containment at times within 24 days following the incident on ██/██/2005, and the facade closely resembled Dr. ███████ (see attached containment breach report).

The change between these states is voluntary, induced by the entity itself, rather than a matter of temperature or pressure in its environment (see attached experimental data). In the gaseous state, the entity is capable of escaping through any non-airtight barrier, allowing it to slip through cracks or under common doors. Light bulbs of 90 watts or greater have been observed to have a profound effect on the entity, as it appears extremely distressed in their presence and will become more solid.

SCP-XXXX was first reported on ██/██/19██ by an individual in the town of ████ █████, ████████████, United States, who claimed to be seeing a "ghost" "out of the corner of [his] eye" repeatedly throughout the day. The individual never reported having been able to see it directly, but nevertheless insisted that something was there. This event even provoked a 9-1-1 report, but no evidence was found, and local authorities recommended psychiatric help. The following day, concerned family members entered the home to insist that the individual seek mental help. The individual was found, deceased, in his living room. The body was badly contorted and had many large, open wounds. The home had no signs of forced entry and no forensic evidence was found. The death was ruled an accident or homicide, and despite a brief investigative effort by local police, the case quickly went cold.

This same scenario occurred to several more individuals. There was always at least 24 days, and no more than 26, between victims. One would-be victim in particular who had escaped her fate was noted for having left 100-watt light bulbs running at all hours of the day and night out of fear of her apparent hallucinations. In this sole instance, the person in question ceased her hallucinations and a new person reported this phenomenon only two days afterwards.

By this point, the apparent string of murders stirred attention from the media and state police. The Foundation had taken an interest due to the unusual circumstances. As a test, a Foundation operative was placed as bait in an isolated house near the source of the reports, and was instructed to use only dim lights while he stayed there. The operative, who had a flawless mental background, confirmed the reports that he would occasionally catch a glimpse of what he described as "some sort of translucent cloud-like creature, with what looked like human-like bone structure suspended within" over the course of the day on ██/██/19██ after residing there without incident for the previous 21 days. The Foundation's agents moved in immediately and [DATA EXPUNGED]. This allowed its capture in a secure box back for transportation to site 37.

Level 2 or higher clearance is required to approve tests involving SCP-XXXX

Experimental Reports

Test 01: SCP-XXXX was transferred to a testing chamber capable of pressurization. Entity exposed to high vacuum conditions for 30 minutes, followed by a sustained pressure of 10 bar for 30 minutes. No change was observed during any of this.

Test 02: SCP-XXXX was transferred to a testing chamber with advanced temperature controls. Entity was exposed to temperatures ranging from 35K-500K. No change in solidity was observed, although interesting behavioral changes were seen. It appeared to huddle in the corner in cold environments while sprawling on the floor in high heat.

Test 03: SCP-XXXX's chamber was fitted with a light bulb of variable intensity. Entity was exposed to the whole range of the bulb's capabilities (150 watt maximum). At the lowest light levels, the entity showed no signs of solidity and did not exhibit any imitation bone structure. As light intensity increased (roughly 30 to 60 watts) the rudimentary elements of a torso and head became visible, including a rib cage and skull suspended in the dark gray mass of gas. As light intensity increased beyond this point, the entity behaved increasingly distressed. Beyond 90 watts, it seemed to undergo irregular mutations - forming bones, limbs, and organs that did were not human. These extra body parts would not persist, however; they would frequently dissipate back into the mass of gas and be replaced by new random mutations. It was unable to form a stable solid (humanoid) state at any light intensity.

Researcher's notes: Now we're onto something. It's response to lights at the high end of normal household use can only be described as abject pain. Does the light induce these mutations - and painfully so? More testing might give us the answer.

Test 04: SCP-XXXX was transported to a testing chamber that was divided down the middle by a semi-permeable polymer membrane which was watertight, but air could freely pass through. The entity was released into the side of the room which had a 100 watt light bulb. The other side of the polymer membrane had no lights. The entity immediately turned gaseous and passed through the polymer membrane to the darker side of the room.

Researcher's notes: Despite the higher-intensity light (in the random mutations range observed in the previous test), it kept strict control of its form and turned completely gaseous in order to escape to the darker side of the room, where it reformed some basic bone structure. In light of this, it certainly seems like its changes in state are not directly induced by the light, but instead voluntary actions that are nevertheless taken in response to light. Additionally, this confirms our suspicions from the start that completely airtight materials are needed to contain this thing.

Test 05: D-Class subject D-XXXX-01 was introduced to the containment cell. SCP-XXXX did not interact with the subject during 20 minutes of close proximity. The subject suffered no adverse affects and the entity made no apparent attempt to harm the subject.

Researcher's notes: Admittedly, we didn't really know what would happen here. There was definitely a chance that XXXX would kill that D-Class just based upon what it was doing to people in the wild, but that didn't happen in a controlled environment that has been designed to suit the entity.

Test 06: D-XXXX-01 was given a glass bottle and asked to try to seal a sample of the gaseous component of SCP-XXXX inside it for analysis. Subject approached XXXX, nervously, and attempted to moved his hand, holding the bottle, towards the entity. XXXX seemed to avoid the subject. The subject was ordered to be more aggressive to acquire the sample. The subject lunged at XXXX with the bottle, and for a moment appeared to have captured a sample, but the subject was physically unable to remove the clasped bottle from the mass of gas until he unclasped the bottle. XXXX seemed annoyed. Subject was told to leave the chamber.

Researcher's notes: Damn! I really thought we could snag a sample of whatever it is that makes up that entity.

Containment Breach Report: When SCP-XXXX was originally captured, initial testing suggested that it could escape through any non-airtight surface. Accordingly, the entity's containment room had concrete walls, airtight doors, and a 1 centimeter thick plexiglass window. On ██/██/2005, for reasons not yet understood, the entity shattered the window and killed the researcher, Dr. █████ ███████, who was currently in the observation room, by means of crudely tearing Dr. ███████'s body open, and sorting through his innards briefly. The entity then proceeded to escape under the door of the observation room and traveled a short distance down the hallway before stopping.

The entity had taken on the appearance of Dr. ███████ in response to the 100-watt light bulbs in the hallway. Its behavior suggested that it was unconcerned with escaping, and it gave no resistance when security personnel recaptured and sent it to a temporary containment room elsewhere, while its usual containment room was being repaired. This was the only case in which the entity's desire to kill an individual could not be explained by a need for survival, as its containment room was equipped specifically with only one 50-watt bulb.

Addendum: We have to conclude that the new plexiglass regulation for SCP-XXXX's containment room will prevent further containment breaches. This thing isn't particularly strong, it's not like it's ever been able to break out of anything else. I think we were just too concerned about the room being airtight and not concerned enough about whether that thin window could get bashed in. 4 centimeters will do just fine - that thing's fake bones will break before the plexiglass does. At any rate, XXXX has not since recreated the events of ██/██/2005. Whether this stems from inability to do so or lack of motive is unknown.