The Necrons' story is one of ancient betrayal. Aeons ago, the Necrontyr race clung to their short lives in fear of oblivion at the hands of their massive and ravaging star. They pushed the limits of science in an effort to lengthen their lives, but to no avail. In their desperation, the looked to their science and discovered ethereal beings feeding on the energies of whole stars. They named these beings the star gods, or C'tan. The C'tan offered the Necrontyr people immortality, but only at a terrible price. We will never know if the Necrontyr knew this price, but their race was completely purged and transferred into new metal bodies.