Damnos - Damnos: Damnos, an Imperial Mining World located in the Ultima Segmentum, was first colonised by the Humans of the Imperium of Man during the Great Crusade, though in fact it was actually already an ancient Necron Tomb World.The Necron presence was first discovered in the north by the Imperials after their awakening in 973.M41, whilst the city of Mandos Prime's geothermic fusion stations were under repair following severe seismic activity. The Adeptus Mechanicus Tech-priests rapidly claimed the right to the xenos artefacts and extradited several specimens to the nearby Forge World of Goethe Majoris for closer study.Soon after, under waves of atmospheric interference that clouded the entire northern hemisphere of the planet, the Necrons emerged from their tombs.The planet went on alert, but the threat was incomprehensible, no warning had been received from the fallen hive cities, and any reconnaissance units deployed never returned. As more hive cities toppled to the unknown invaders, word of the assault finally got through to the planetary governor, who deployed every regiment under his command.Within six solar months almost all of Damnos' vast manufactorum hive cities were in ruins, and the planetary capital of Kellenport finally fell to the Necron forces in 974.M41.The 2nd Company of the Ultramarines answered the planet's distress call in 974.M41 and helped to evacuate the remaining Imperial survivors before the Imperial Navy unleashed an Exterminatus-level orbital bombardment upon the planet's surface at the request of the Adeptus Astartes that was erroneously believed to have eliminated the Necron threat.This campaign became known as the Damnos Incident in Imperial records.In the wake of the failure to clear Damnos of its Necron presence, the Ultramarines 2nd Company under the command of Captain Cato Sicarius returned to the world in 999.M41 to eliminate the xenos once and for all. This campaign, the Second Battle of Damnos, proved successful after the Imperial forces successfully destroyed a Tesseract Vault containing a C'tan Shard of Yggra'nya, the World Shaper. The liberated but enraged star god proceeded to assault Imperial and Necron forces alike until Cato Sicarius banished the entity into the Warp using a Vortex Grenade.In the wake of the Second Battle of Damnos, the battered world's remaining Necron tomb complexes were cleared of all remaining resistance by the Ultramarines and allied Astra Militarum troops. The citizens of Damnos whom Sicarius had rescued solar decades before were restored to the world and allowed to begin to redevelop it into a productive Imperial colony.Unfortunately, at some time in the Era Indomitus, the world was assaulted by the Necrons of the Szarekhan Dynasty who were determined to avenge the Necrons' prior loss to Humanity. Though the Ultramarines were heavily engaged in other conflicts of that era, they still managed to send a strike force comprised of a small number of Ultramarines reinforcements aided by regiments of the Ultramar Auxilia. These forces initiated what was later called the Third War for Damnos. They were joined by Astartes reinforcements sent by the  Iron Hounds, Brazen Consuls and Libators Successor Chapters of the Ultramarines and further warriors from the Salamanders and White Scars who arrived in the system once battle had already been joined.