Dr. Keingå's Lab Notebook

Item #: SCP-XXXX

Object Class: Euclid

Special Containment Procedures: All instances of SCP-XXXX-1 are to be confined to a standard humanoid containment cell at Area 12, Sector ██, Floor ███. In addition to standard human food and water rations, each cell should be supplied with five slices of highly carbonised toast and a variety of international newspapers daily. In the case of an interruption in the supply of toast, the holding facility is to be equipped with three 60-liter carboys containing a mixture of mutagenic chemicals to be administered to SCP-XXXX-1. In the case of a containment breach, Class-B amnestics should be deployed to safely detain all instances of SCP-XXXX-1.

Personnel who wish to interact with SCP-XXXX must have not worked on any project that involves any form of cellular mutagen, including but not limited to: gamma, UV and ionising radiation, methylating agents, transposing agents, and any SCP that exhibits behaviour that causes or exacerbates DNA damage. Researchers and security personnel must first pass a detailed medical inspection and karyotyping of multiple somatic cell types to ensure that no significant numbers of cancerous cells are present within the body. Personnel assigned to SCP-XXXX must report to Medical on a weekly basis in order to ensure that observable mutagenesis has not occurred. Failure to pass this test will result in quarantine and eventual reassignment.

D-class personnel that have been exposed to SCP-XXXX for testing must be terminated and incinerated six months after initial introduction.

Description: SCP-XXXX is a fleshy mass of variable size and shape, dependent on the physical dimensions and species of its current host. Eight instances of SCP-XXXX currently reside within the cranial cavities of eight human subjects (hereafter referred to as SCP-XXXX-1), confirmed through noninvasive nuclear magnetic resonance and metabolism imaging.

SCP-XXXX was first discovered on ██/██/12 inhabiting the body of a 23-year-old South Indian male who had been diagnosed with Stage III cancer of the cerebellum and surrounding tissue of the spinal cord. The subject had been undergoing an intensive series of radiotherapy treatments at the ███ ██████████ Medical College and Research Institute with minimal success in reducing the size of the mass. Two months into the radiotherapy regimen, the subject was reported to have exhibited strong urges to return to the clinic for additional treatment, even following the onset of symptoms of moderate radiation poisoning and against discouragement of his family and medical personnel. SCP-XXXX was recovered when the subject expired upon jumping out his apartment window to reach the clinic when his family refused to let him undergo any further radiotherapy.

SCP-XXXX is a sentient symbiont that thrives off of radiation exposure cellular mutagens of both physical and nonphysical nature, seemingly deriving energy from the DNA repair response of the host. Currently known viable mutagens include ethylmethane sulfonate, Tn10 transposon, aflatoxins and Co-60. Outside a living host, SCP-XXXX exists as a highly viscous red slurry of cellular matter and mutagenic particles, and is highly vulnerable to physical damage. SCP-XXXX will seek out humans and infect them through skin contact. As current knowledge stands, the life cycle of SCP-XXXX is summarised as follows:

Stage 1: Following infection, SCP-XXXX migrates to the host's brain via the bloodstream and induces high levels of cellular mutagenesis in order to generate cancerous cells.

Stage 2: SCP-XXXX cultivates the cancerous cells, appearing as a benign tumour until it reaches the size of a T3 mass.

Stage 3: SCP-XXXX induces sudden malignancy when the mass reaches a sufficient size, appearing as a highly aggressive glioblastoma. In this stage, the host's DNA repair mechanisms attempt to control the mass, nourishing SCP-XXXX and allowing it to grow in volume. This is exacerbated if radiotherapy is applied to control the mass, as the radiation results in additional damage to the host's DNA. SCP-XXXX itself appears to be immune or highly resilient to radiation damage.

Stage 4: As intracranial pressure increases due to the growth of SCP-XXXX, the organism begins to consume and assimilate brain tissue from the host. SCP-XXXX begins to exhibit sentience during this period, as it gains mass and adopts the host's behaviour in order to avoid detection. However, this assimilation process is not perfect and results in erratic behaviour of the host.

Stage 5: SCP-XXXX eventually entirely occupies the host's cranial cavity and takes complete control of the host, dispensing with the host's original personality and exhibiting sentience and intelligence. Stage 5 victims of SCP-XXXX are often articulate depending on the host's level of comprehension and linguistic fluency prior to infection, and will often attempt to seek out sources of cellular mutagenesis for nourishment, the most common being burnt food items, radioactive samples or laboratories containing mutagenic chemicals.

Following the death of the initial victim, 3 members of the recovery team and 8 bystanders were contaminated through contact with SCP-XXXX, and brought in for quarantine and examination. Upon reaching Stage 5 of infection, attempts were made to communicate with each victim of SCP-XXXX, recorded in Addenda XXXX-A through K.

Addendum XXXX-A
Subject is a Latina female, 33-year-old member of the recovery team sent to retrieve SCP-XXXX. Developed Stage 5 symptoms after 3 months, 12 days of observation. Interview conducted by Dr. █████ shortly after complete assimilation of host's mind. The subject was highly fluent in English prior to assimilation, and provided with a supply of highly carbonised toast to nourish SCP-XXXX.

From the interview transcripts in Addenda A through K, it was established that SCP-XXXX retains clear memories of its past incarnations and adopts a level of comprehension consistent with its previous host's linguistic ability. It is currently believed that SCP-XXXX possesses no form of nonverbal communication with other instances of SCP-XXXX. Aging and senescence appear to affect SCP-XXXX hosts as would an uninfected specimen. As of the interview date, SCP-XXXX appears to exhibit no urges to spread to other creatures. Complaints from SCP-XXXX concerning the variety of food sources offered are not to be addressed until further notice.

Note from Dr. █████: I think we can use SCP-XXXX's memories to our advantage as an archival agent. So far, it doesn't look like they want to kill us, breach containment or otherwise go nuts, as long as we keep them fed. I propose we keep SCP-XXXX as a living memory drive in case it contains memories concerning other skips. I'm ordering some tests using amnestics to see how effective they are on this thing. For now, supply their rooms with newspapers so they can keep up with current events.

As of ██/12/14, eight of the original twelve infected subjects exhibit symptoms of SCP-XXXX. Subjects B and C were terminated following the an experiment involving depriving them of a mutagenic source, and the resultant cranial contents of the subjects were retrieved and stored. This sample is currently held in Area 12, ████████████ ██████ █████████. Subject F is currently in a vegetative state following the administration of a Class-C amnestic. Subject K was declared deceased following exposure to a Class-D amnestic. All remaining subjects have been designated as SCP-XXXX-1 due to the highly congruous nature of their shared memories, and have been separated from each other to prevent them from sharing or synthesising knowledge between each other. Class-B amnestics have been found to be effective in sedating all instances of SCP-XXXX-1 for a duration between 8 and 433 minutes, with complete memory loss of all events from a two to six hours prior to dosing.

SCP-XXXX has so far displayed memories or knowledge concerning various known SCP objects, including but not limited to SCP-423, SCP-348 and SCP-453. SCP-XXXX has been reported to express admiration for SCP-610, claiming that "while [they] looked up to [SCP-610's] virulency, [SCP-610] is not much for conversation.". Testimonies from SCP-XXXX seem to indicate that it is affected by cognitohazards and mind-affecting effects; however, it appears to possess the ability to selectively expunge any effects it deems hazardous to itself between hosts. SCP-XXXX also loses any memories associated with a host affected by such hazards, likening these episodes to 'bad dreams'.

Addendum XXXX-01: A proposal to establish an instance of SCP-XXXX at all Foundation sites to act as a living backup for Foundation files has been denied by the O5 Council until the behaviour and motivations of SCP-XXXX are better understood, citing the fact that "SCP-XXXX remains a sentient being and entrusting sensitive Foundation knowledge to it changes it from a millenia-old tumour to a Foundation liability". Information presented to SCP-XXXX is to be carefully regulated and vetted.