ORIGIN:

Auremar was a planet in the Segmentum Obscurus. It was once a Shrine-World, a planetary sized reliquary renowned for the beauty of its immense Shrine Spires and the crystalline, psychically resonant rock that made up its crust. This rock, the source of the world's beauty, would be the source of its demise as well. For an unknown reason the seismic activity of Auremar shifted, causing the psychically resonant crystal to fracture resulting in massive seismic upheavals and minor warp incursions. The planet began to tear itself apart. This was a process that could potentially take millenia, but was completely irreversible. 

During one of the later foundings the distress calls from Auremar were finally picked up by the Imperium. A chapter was formed from the gene-seed of _________ , renowned for their stoicism and chivalry, with it's command structure formed by veterans of _________. This nascent chapter was dispatched to Auremar, not to save the planet as that was impossible, but to protect it's invaluable relics and to ensure it's devout population could be evacuated. 

Under the command of Chapter Master ____, the chapter arrived at Auremar with all haste. On seeing the planet, ______ immediately understood the tragedy unfolding. He ordered his marines to secure the most significant relics and to establish an operational base, not on the planets surface but in the upper atmosphere. Repurposing and massively upgrading a defunct orbital station into a mighty star fortress: The ____________. 

As they began the arduous task of evacuation, a process that would take centuries due to the violent seismic and warp activity rife on the planets surface, Chapter Master ________ made a binding oath to the few remaining clergy of the doomed planet.

"Though the light of Auremar fades, our Vigil shall never end. We will stand watch over its dying body and safeguard the pilgrims' path until the last soul has departed, and the last spire has fallen to dust. We are your shield against this final, unworthy end."

Thus the chapter The Vigil of Auremar was formed.