The Forge World of Xana has a dark and shrouded history with the Lacrimallus not being an exceptione. The most secretive parts of the Magos Lacrymartae are even said to experiment with forbidden technologies reaching beyond the shroud to bring dead flesh back into their service.
It is said by some that each Custode believes he knows how best to protect the emperor; this is certainly true for the sodalite 'Quod Perierat'. It is their belief that the best way to fulfil their duty to the Master of Mankind is through manipulation of individuals within the Imperium. Few know the reasoning behind their choices in who they protect, replace or kill; nevertheless their strikes are direct and focus on achieving their objective to some greater end almost certainly unknown to the lucky recipient of their help and the unlucky victim of their wrath, alike. Their willingness to achieve their ineffable goal knows no limits, so much so they they have been rumoured to help even traitor legions fight Astartes loyal to the Emperor; all to further the ..more..