CLASSIFIED DOCUMENT 603GV-EYES ONLY. Anomalous structure "Erebus Citadel" materialized in 1856, defying spatial logic. Observers reported a "folded" architecture, with staircases converging into impossible geometry. Witnesses described an intense, pulsating "glint" emanating from the core. Subsequent investigations were hindered by inexplicable "slippage" in temporal records. Researchers vanished while attempting to triangulate the citadel's position. Last transmission from the site described an "unraveling" of local reality, as if the fabric of existence was being "raveled" into a knot. All further inquiry has been suspended due to unmitigated risks. Erebus Citadel remains an enigma, shrouded in an impenetrable veil of chrono-spatial disruption.