From Warhammer 40k - Lexicanum
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6 April
===Treatment of the Dead===
Upon death, where practical, the body of a Raven Guard Marine will be stripped of its equipment and trappings (including the Corvia), harvested of its [[gene-seed]] and left for the local carrion birds to feed upon.{{Fn|19}}
==="Wraith-Slipping"===
Described as being a combination of mental discipline and martial art, the process of "wraith-slipping" is to take advantage of one's surroundings to conceal one's presence. This is not a psychic power but rather a collection of disciplines and techniques that the Raven Guard use to conceal their visual and aural presence despite their use of power armour. It is a technique that is described both prior to the outbreak of civil war in the Horus Heresy{{Fn|24b}} and up to the 41st Millennium.{{Fn|21}}
====Corspake====
Corspake is a form of sign language taught to all members of the Raven Guard. This allows them to communicate on the battlefield without having to risk themselves to exposure by speaking or using [[Vox]] technology. Notable signs include The Crowfane; the Feast of Bones;
the Empty Chime; even the Murder Call, which calls for vengeance against the slayer of a great hero. The 2nd Company is known for its prodigious use of Corspake, and none can rise to the rank of Shadow Captain without mastering it.{{Fn|36m}}
===Shadowmasters===
