|This location exists primarily or exclusively within the Pre-Super Genesis Wave continuity.|
Information in this article may not be canonical to the storyline of the games or any other Sonic continuity.
Mobius PrimeAn ugly, nightmarish and foreboding spire, it reflected the corrupted views of Dimitri when he tried to take over Angel Island roughly four hundred years ago after his transformation. Modeled after the Dark Tower he erected which became Mount Fate centuries ago, it was strategically located where the Hall of Learning was in the former site of Echidnaopolis. The citadel had multiple levels with its own environmental control and facilities for Enerjak's followers, as well as an overlook and entrance hall. The ground floor was where Knuckles the Echidna and Archimedes battled and defeated the Chaotix after barely escaping the city's Mechanaut force. Enerjak then subdued the two and brought them to the highest level of the citadel where he and Knuckles engaged in hand-to-hand combat. Archimedes, in the meantime, contacted more of his fellow fire ants who gathered to eat out the foundation of the building's top floor. At the same time, Locke sent a series of remote-controlled rocket booster modules from Haven to attach to the uppermost level of the citadel which then activated. Between the assistance of both parties, Knuckles and Archimedes managed to narrowly escape through a hole in the citadel's floor as the boosters carried it and Enerjak into space and a low-level orbit around Mobius. With Enerjak gone, the rest of the citadel as well as Nekronopolis, vanished into thin air. (KMS: #3)
Dark Enerjak rebuilt the Citadell of Darkness after he took control over the world, he primarily lived in his throne room, with the spire containing the core-less bodies of his fallen foes.