Noting that new site member 
iceiv (account age 674 days, site membership 3 days) recently coldposted the following page, which has multiple indicators of AI-generation: https://scp-wiki.wikidot.com/scp-8215/comments/show "SCP-8215 “Time Lost Twin”"
Item #: SCP-8215
Object Class: Keter
Special Containment Procedures:
SCP-8215 is contained in Subterranean Containment Chamber 85-A, 9.3 km beneath Site-██, suspended within a safety-reinforced magneto-thermal housing in chambered molten rock. The chamber is surrounded by pressurized infested seawater from [DATA EXPUNGED], with an inert Leviathan-Class Entity (LCE-01 “Above-Brother”) suspended over the core access. Disruption of SCP-8215’s seal will trigger Class-7 lockdown and activation of the Leviathan deterrent failsafe.
At no time should any living creature venture closer than 300 meters to SCP-8215’s area without employing complete psychic dampening equipment, multi-layered biometric camouflage, and anesthetic neuro-stabilizers. Any personnel who become victims of “twin hallucinations,” the sensation of being watched, or the sudden creation of memories of a sibling never before recorded are to present for instantaneous psychiatric quarantine and amnestic treatment.
Constant monthly “cognitive radiation” pulses from the Orbital Mnestic Disruptor Array keep any subterranean life or external psychic influence from filtering into the container.
Description:
SCP-8215 is a cognitohazardous, shape-shifting object that manifests as the viewer’s exact biological twin, even when the person is an only child or has no prior knowledge of siblings. It can change mnemonic reconstruction, fabricating false memories and collective affective experiences that are indistinguishable from reality for the victim.
Within 4 to 9 days, subjects exposed to it report:
• Sudden recollection of collective childhood experiences (verified to be fabricated).
• A compulsion to reunite with SCP-8215.
• Dissolution of boundaries between self and “twin.”
• Deteriorating mental state, typically causing suicidal ideation or voluntary annihilation, described as “going back to the twin.”
Autopsies of victims reveal widespread reorganization of the limbic system and hippocampus, akin to individuals with life-long emotional bonds.
SCP-8215 always has an immaculately human appearance, but cannot be recorded by non-organic sensors. It is also believed to be semi-temporal, being present in both the past and future of its chamber, with minimal deviations regarding when it is seen. This time distortion effect assists its designation, “██ ███ ███ ███.”
Addendum 8215-1: Incident Log Omega-7
Extract from Test Log:
“Subject D-9082 entered visual range of SCP-8215 through a triple-layer cryo-tempered view tube. Subject did not move for 6.3 minutes before speaking: ‘She’s waiting… she remembers the blue swing and the bruised apple…’ There is no record of any sibling or event as described. Subject began self-injury within 14 hours, repeating ‘she wants her life back.’”
Addendum 8215-2: The Leviathan Lock
The Leviathan-Class Entity, LCE-01, sits above the containment sea. It is theorized to be SCP-8215’s original twin, or an anti-form—its presence bars SCP-8215 from reaching the surface or spreading its influence past. Foundation theologians and metaphysicists continue to study if the two are opposing archetypes of “loss” and “remembrance.”
Excerpts of note:
Within 4 to 9 days, subjects exposed to it report:
• Sudden recollection of collective childhood experiences (verified to be fabricated).
• A compulsion to reunite with SCP-8215.
• Dissolution of boundaries between self and “twin.”
• Deteriorating mental state, typically causing suicidal ideation or voluntary annihilation, described as “going back to the twin.”
Addendum 8215-1: Incident Log Omega-7
Extract from Test Log:
“Subject D-9082 entered visual range of SCP-8215 through a triple-layer cryo-tempered view tube. Subject did not move for 6.3 minutes before speaking: ‘She’s waiting… she remembers the blue swing and the bruised apple…’ There is no record of any sibling or event as described. Subject began self-injury within 14 hours, repeating ‘she wants her life back.’”
Addendum 8215-2: The Leviathan Lock
The Leviathan-Class Entity, LCE-01, sits above the containment sea. It is theorized to be SCP-8215’s original twin, or an anti-form—its presence bars SCP-8215 from reaching the surface or spreading its influence past. Foundation theologians and metaphysicists continue to study if the two are opposing archetypes of “loss” and “remembrance.”
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