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*{{Main|Invasion of Tanakreg}}Tanakreg was known for its formidable air-defence network{{Fn|1}} and its immense salt mines. It was also home to a [[Necron]] [[Monolith]], buried deep within the planet's crust.  It The planet was attacked and devastated by the [[Word Bearers]] [[Legion]] led by a [[Dark Apostle]] by the name of [[Jarulek]]. The local [[PDF]], numbering approximately 200,000 men, was subsequently slaughtered. Minimal casualties were suffered by the Word Bearers due to propagating cult uprisings and internal corruption of people inside of the higher echelons. This caused the Air-Defense turrets to be turned offline due to sabotage of the power cores during the assault, leaving the skies open for Deep Striking Chaos Marines.  The [[Word Bearers]] believed that the [[Necron]] tomb was a weapon that could be used against the Imperium of Man in order to disable warp travel in a given area, this artifact which causes this horrifying effect is called the [[Nexus Arrangement]].{{Fn|1}} The Word Bearers unknowingly unleashed the Necrons, and it can be reasoned that this was one of the first encounters with the Necrons themselves. The [[Necron Lord]] of the planet of Tanakreg was called [[The Undying One]], a Necron Lord mounted on a hybrid of a [[Destroyer Body|Destroyer body]] and the tiny immaculate scarabs that make up the Lord. Upon entrance to the tomb [[Marduk]] and the Dark Apostle found a "sea of silver" which was revealed to be these insignificant scarabs, the smallest being no bigger than a grain of sand, together they formed the Necron Lord. This also reveals a different way of regeneration not seen in any other Necrons recorded. Among the [[ImperialM41]] forces sent to reclaim the planet, the [[Elysian Drop Troops]] and [[Adeptus Mechanicus]] pursued different agendas. The [[Imperial Guard]] wished merely to annihilate the [[Chaos Space Marines]] and retake the world, whilst the Adeptus Mechanicus desired to keep the Word Bearers from discovering the Necrons.{{Fn|1}} The Imperial deployment saw one Imperator [[Titan]] used: The Exemplis of the ancient [[Legio Ignatum ]] of Mars. Another Mechanicus machine was used, an [[Ordinatus|Ordinatus Machine]], an enormous tank-like vehicle with a powerful Sonic Weaponry Cannon used by Titans attached to it. This sonic cannon blasted ultra-high and ultra-low frequencies which shattered armor, flesh, and stone alike under the sonic barrage.