agistus Amon was known well beyond his Legion during the time of the Great Crusade, for he often served both as his Primarch’s equerry and emissary to other Space Marine Legions and the Imperium’s circles of power. The Keeper of the Keys is nevertheless a solitary and mysterious figure, even to his brothers – he is said to have served as Magnus’ tutor on Prospero, and joined the Thousand Sons as both a cunning warrior and powerful psyker. Many believe he also serves as master of his Legion’s intelligence gathering organisation, known as the ‘Hidden Ones’ , employing his talents to blind the