The '''Second War of Secession''' took place during the [[War in Heaven (Necron)|War in Heaven]]. As the war against the Old Ones deteriorated and the Necrontyr race became but a minor annoyance to them, the Necrontyr dynasties again fractured and fought for dominance over one another. The wars only ended with the apperance of the [[C'tan]], whose promises of immortality and victory over the Old Ones gave the Necrontyr reason to unite once more.{{Cite ThisFn|1}}