At the other end of the spectrum were highly-ranked individuals whose positions within the upper echelons of the Imperial Expeditionary Fleets granted them access to knowledge others were denied. Though many aberrant human cultures were entirely obliterated, conservators attached to the Great Crusade fleets strove to record tales of the defeated foes of Mankind, from ravening alien horrors to recalcitrant human societies. Much of this knowledge was locked securely away and remained accessible only to the most senior of human and transhuman leaders, for many accounts contradicted the atheistic doctrines of the Imperial Truth and could not be allowed to fall into the hands of the weak or the ignorant. Inevitably however, some did, and many senior conservators were compromised by the events they recounted or the accounts in their custody. Men and women who had dedicated their entire lives to proving primitive superstitions false discovered that their own beliefs in empiricism and rationality were in fact founded upon lies. When the Age of Darkness fell, the knowledge watched over by many conservators escaped into the hands of madmen and Traitors who preached it to the Warp-slaved multitudes.