Soul Drinkers - Necrons: While fleeing from an Adeptus Mechanicus task force, the Soul Drinkers' Space Hulk was severely damaged and found itself low on fuel. Forced to run from the Mechanicus forces, the Soul Drinkers went deep into the Veiled Regions of the galaxy in search of fuel. They discovered the Necrons active on many worlds in this region of space, all with signs of previous human settlement, but now infested with the undying, ancient xenos.Eventually they came upon the last of the human worlds that the Necrons were still in the process of cleansing of all life, and the Soul Drinkers made a deal with the survivors. They allowed the humans time to retreat to their spacecraft while the Soul Drinkers held the Necron forces off, in exchange for the Soul Drinkers receiving fuel.The Soul Drinkers held out against the Necrons, and the escaping human population reached their spaceport as agreed, but a Necron fleet arrived in-system, preventing them from leaving. The Adeptus Mechanicus fleet arrived shortly after, and the two fleets began fighting each other. It became obvious that the Imperial forces would soon be destroyed by the more potent Necron fleet, so they began a complex pattern of manoeuvres intended to delay the inevitable.When the Soul Drinkers realised they could not beat the approaching Necron force on the ground, while the Mechanicus fleet would lose in space, Sarpedon offered an alliance to the Mechanicus. Chaplain Iktinos of the Soul Drinkers and his "flock" of Space Marines remained behind to help defend the spaceport and the surviving humans. It is revealed that Iktinos, and through him his "flock", is loyal to another master, and not the Emperor of Mankind, although the identity of this master was never clear.Accepting the proposed alliance from the Renegade Space Marines, the Mechanicus and the Soul Drinkers set off for the main Necron crown world, Selaaca, planning to destroy the Necron Lord and leave the rest of the enemy forces in the region leaderless.Arriving at the Necrons' Tomb World, the Mechanicus crashed their starship into Selaaca and deployed their forces alongside the Soul Drinkers. A long, bloody battle ensued as the unlikely allies sought to kill the Necron Lord before the Necrons' superior numbers overwhelmed them.Finally, the Imperials arrived at the Necron Lord's headquarters and Sarpedon duelled and defeated the undying creature. However, in typical Necron fashion, the Necron Lord soon resurrected itself, and began crushing Sarpedon to death. Only through the sacrifice of Techmarine Lygis was the Necron Lord finally defeated.Gathering his forces, Sarpedon led his remaining warriors towards the crashed Adeptus Mechanicus starship, where their promised transports off-world were to be awaiting them. Instead, they discovered three Imperial Fists Thunderhawk gunships deployed upon the surface of Selaaca, while twenty Imperial Fists of the elite 1st Company in Terminator Armour teleported onto the planet, lead by First Captain Darnath Lysander.Lynsander ordered the Soul Drinkers to surrender to Imperial justice or be destroyed. Sarpedon replied by invoking the right to challenge Lysander to a personal duel.Despite Sarpedon's Warp-enhanced strength, he had been badly depleted in the earlier fighting and was swiftly defeated by Lysander in single combat. Sarpedon had ordered the Soul Drinkers to surrender if he was beaten by Lysander in the duel and thus prevent the Chapter from being wiped out by the Imperial Fists.