Necrons

the Necrons are a mysterious skeletal robot-like race that have lain dormant and largely unknown by the other races of the universe for untold hundreds of million years, and are reemerging in the distant future of the Warhammer 40,000 universe. Within the game's universe, the Necrons have become known and feared for their ability to absorb physical punishment, as well as their enigmatic, yet powerful, Gauss weapons and technology.