По поводу памяти и интеллекта, цитаты из кодекса:
"Whether the Necrontyr truly realised the price they would pay for accepting this pact with the C'tan will never be known, but their race was utterly purged, becoming instead the Necrons, and cursing themselves to eternal servitude of their star-born gods. The C'tan feasted upon their entire race, leaving behind only ghostly echoes of the Necrontyr. Only the few of the very strongest retained their intellect and even they were shadows of their former selves"
"Only one thing truly remained of their race, a burning hatred of the living"