CLASSIFIED BRIEFING 65019: EREBO INCIDENT. A localized distortion in the space-time continuum occurred on February 30, 1987, at the Cipher Citadel, an ancient, labyrinthine structure in the depths of the Caucasus Mountains. The anomaly, code-named "The Devouring Fold," caused a 37-minute discontinuity in the citadel's architecture, resulting in the disappearance of 47 stone pillars and the inexplicable rearrangement of 319 cryptic murals. Fragmented reports from surviving witnesses describe a "cascading silence" and "geometric seizures" that afflicted all who approached the citadel during the incident. Further investigation is hindered by the citadel's self-modifying layout, which seems to thwart all attempts at cartographic analysis.