The Necrons received their first, full sourcebook with the release of Codex: Necrons in August 2002.

When were Necrons added to 40k?

The Necron race has come a LOOOONG way since it's first appearance right around 2000. Take a look at how it all began. All the newcomers see the mighty Necron race as the ancient deathless armies of the various tomb World Dynasties – come to reclaim thier lost empire.

What edition were Necrons added?

Codex: Necrons is an expansion book for the Games Workshop table top game Warhammer 40,000. This book was published for the first time in 2002, and is for the 3rd Edition of Warhammer 40,000.