House Vornherr was a Loyalist Imperial Knight House that had strong ties to the Imperium of Man. This Knightly housed hailed from the Feudal World of Luhnborg-IX, located in the Ultima Segmentum, and were known to be an honourable company of warriors with a record of distinction within the Great Crusade and had, by fortune of war, sworn to Roboute Guilliman, Primarch of the Ultramarines Legion, a binding oath. This was a promise which saw the majority of the House muster in the Veridia System for the auspicious Calth Conjunction. With the unveiling of the Word Bearers' betrayal, in what would become known as the Battle of Calth, most of these Knights in attendance were callously and cowardly cut down from orbit by a Word Bearers planetary assault squadron. Only a handful survived the initi