Necrons are robotic skeletons from warhammer 40k. They are ruthless killers who's primary function is to kill everything that moves, they have been known to re-generate after being blown apart and are the most deadly foe to face if you are a guardsman. A Necrons primary weapon is the gauss rifle (i dont know the actuall name, i just used the name the guardsmen give it) that can evaporate parts of or even a whole human.