Veil of Darkness
The Veil of Darkness is part of the Necron Armoury and may be taken only by Necron Lords.
The Veil of Darkness, along with its sister artifact, the Phase Shifter, are the only artifacts that can become part of the Lord's body once used and cannot be removed. This ancient artifact operates the same way as other teleportation devices used by the Imperium and the Eldar, except that it is instantaneous. The Lord can summon darkness which twists and bends space like a ghostly cloak blown by an ethereal breeze. When the darkness finally abates, the Lord and those following him have disappeared, only to mysteriously reappear elsewhere moments later. This artifact, combined with the Necron Lord's already passive teleportation ability, makes him impossible to be targeted in the field of battle.
