From Lexicanum

The Resurrection Orb is part of the Necron Armoury and can only be taken by the Necron Lord as part of the Necron army. The Lord operates it with a gesture and the scattered remains of destroyed Necrons pull themselves together and return to the battle. This is a most eerie sight.

Sources

• Codex: Necrons (3rd Edition)

See also

• Necron Armoury