A circular stone chamber intermittently encountered beyond the eastern preservation corridors during periods of elevated archive instability. The location does not appear on surviving structural maps and has repeatedly failed rediscovery attempts following initial observation. The chamber contains wall-mounted shelving surrounding a central stone chair positioned beneath a narrow ceiling opening through which water periodically enters. Examination revealed extensive dust impressions indicating long-term storage of numerous large objects no longer present within the room. Acoustic anomalies include delayed echoes whisper-like vocal phenomena and apparent name recognition responses directed toward observers. During initial documentation a warning phrase carved into the stone chair in Medusa's own handwriting was recorded reading "when the voices return do not answer them". The chamber disappeared prior to secondary investigation. Physical evidence recovered afterward included black stone dust and fragments of unidentified shelving pottery found within clothing worn during the encounter.