Torias Telion: The Eye of Vengeance (Black Library Advent Calendar 2013 #3)

As the daemon lord MKar and his forces assault Ultramar itself, the warriors of the Ultramarines muster for war. As the Third Company prepare to take the battle to the enemy, a threat is revealed upon Macragge itself and only the renowned sniper Torias Telion can stop the devastation that will ensue if the foes plan comes to fruition. A Lords of the Space Marines short story by Graham McNeill