Noting that 
Zlappito (account age 1038 days) recently applied for site membership. They have the following sandbox created 19 hours ago, which has many obvious common indicators of AI-generation: https://scp-sandbox-3.wikidot.com/sandbox:zlappito-echo-predator
Revision 0 retained, no edits.
Item #: SCP-XXXX
Object Class: Euclid
Special Containment Procedures:
SCP-XXXX is contained in a sound-dampened, anechoic chamber at Site-██. The chamber is lined with multi-layer acoustic foam, vibration-isolating mounts, and active noise-cancellation emitters. No reflective surfaces are permitted within the containment area.
Personnel interacting with SCP-XXXX must wear noise-suppressing suits equipped with white-noise generators. Direct vocalization within 30 meters of SCP-XXXX is prohibited. All communication is to be conducted via text-based systems or pre-recorded messages that do not produce echoes.
In the event of an acoustic breach, Site-wide echo suppression protocols are to be enacted immediately, including the activation of broadband noise emitters and evacuation of affected corridors.
Containment strategy prioritizes controlled acoustic environments, as attempts at physical restraint have proven ineffective.
Description:
SCP-XXXX is an incorporeal predatory entity that cannot generate sound of its own. Instead, it sustains itself by consuming echoes—defined as reflected, repeated, or residual sound waves produced by external sources.
When SCP-XXXX is deprived of sufficient acoustic stimuli, it exhibits hunting behavior. Initial manifestations include localized acoustic dampening, followed by the progressive loss of physical and perceptual traits associated with sound-producing organisms.
Documented progression in affected subjects is as follows:
1. Loss of audible echoes when speaking or moving
2. Suppression of ambient reflections (mirrors, glass, water surfaces cease to reflect the subject)
3. Absence of shadows regardless of lighting conditions
4. Partial spatial desynchronization (delayed physical interactions)
5. Complete erasure from observable reality
Subjects erased in this manner leave behind no physical remains. Audio recordings taken shortly before erasure frequently contain truncated waveforms, as if portions of the sound have been excised.
SCP-XXXX is not visible to the unaided human eye. Detection is most reliably achieved through anomalies in acoustic readings, visual distortion in high-speed cameras, or the sudden absence of reverberation in enclosed spaces.
Addendum XXXX-1: Discovery
SCP-XXXX was first encountered following a series of unexplained disappearances in ███████ Caverns, New Mexico. Search-and-rescue teams reported that shouted calls failed to echo, despite the cavern’s geometry.
Audio analysis revealed sound waves terminating abruptly mid-reflection. Within 48 hours, three personnel were declared missing after reporting that their footsteps "felt quieter than they should have." SCP-XXXX was successfully lured into containment using controlled reverberation chambers.
Addendum XXXX-2: Experiment Log (Excerpt)
Test: Sustained sound deprivation
Procedure: SCP-XXXX isolated in a fully anechoic environment for 72 hours.
Result: After 41 hours, anomalous suppression extended beyond containment walls. Personnel in adjacent corridors reported loss of vocal echo and mild derealization. Test terminated.
Conclusion: SCP-XXXX requires a minimum level of ambient echo to remain spatially localized.
Addendum XXXX-3: Interview Log
Interviewed: SCP-XXXX (via acoustic proxy)
Method: Pre-recorded echo loops played into containment chamber. SCP-XXXX responses detected as waveform deletions.
> Foundation: Why do you take echoes?
>
> SCP-XXXX: *[Portions of audio missing]* We eat what is left behind.
>
> Foundation: What happens to those you hunt?
>
> SCP-XXXX: They become quiet.
Further questioning resulted in accelerated echo consumption. Interview discontinued.
Addendum XXXX-4: Containment Note
Analysis suggests SCP-XXXX does not perceive humans as prey, but rather as sources of acoustic residue. Erasure is a byproduct of prolonged depletion, not deliberate hostility.
> Silence is not absence. It is hunger.
Excerpts of note:
Description:
SCP-XXXX is an incorporeal predatory entity that cannot generate sound of its own. Instead, it sustains itself by consuming echoes—defined as reflected, repeated, or residual sound waves produced by external sources.
Addendum XXXX-3: Interview Log
Interviewed: SCP-XXXX (via acoustic proxy)
Method: Pre-recorded echo loops played into containment chamber. SCP-XXXX responses detected as waveform deletions.
Foundation: Why do you take echoes?
SCP-XXXX: *[Portions of audio missing]* We eat what is left behind.
Foundation: What happens to those you hunt?
SCP-XXXX: They become quiet.
Further questioning resulted in accelerated echo consumption. Interview discontinued.
Addendum XXXX-4: Containment Note
Analysis suggests SCP-XXXX does not perceive humans as prey, but rather as sources of acoustic residue. Erasure is a byproduct of prolonged depletion, not deliberate hostility.
Silence is not absence. It is hunger.
Permanently banned, PM sent. subtletea, storm, afto, Kufat supported ban.
