Necrons

The Necrons are an ancient alien species of humanoid, robotic skeletal warriors in the Warhammer 40k Universe that have lain dormant in their stasis-tombs for more than 60 million Terran years. They are the soulless creations and former servants of the ancient C'tan, the terrible Star Gods of Aeldari myth.

Their technological prowess is probably unmatched by any of the other intelligent species of the galaxy. They are ruthless, undying killing machines who are determined to exert their mastery over the galaxy.