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The Cryptosi were an exotic meta-dimensional Xeno species that came into conflict with the Imperium, after attacking several of its colony worlds, during The Great Crusade. What became of the Cryptosi after a Sub-Company of the Alpha Legion was sent to investigate the atrocities they committed is unknown; though the Imperium soon lost contact with the colony worlds they attacked, due to the actions of the Legiones Astartes.[1]