Necrons are a fictional race from the Warhammer 40,000 universe, known for their skeletal appearance and advanced technology. They are ancient, robotic beings that once were a living species but transformed into machines to achieve immortality. Necrons are characterized by their cold, calculating nature and a desire to reclaim their lost empire. The Necrons are part of a larger narrative involving various factions, including Space Marines and Chaos. They possess powerful weaponry and can regenerate after being damaged, making them formidable opponents on the battlefield. Their lore explores themes of resurrection, the passage of time, and the consequences of seeking eternal life.