A Gravity Displacement Pack is an advanced form of Necron technology used only by Triarch Praetorians to defy gravity and move rapidly to any point on a battlefield from the air, serving as Necron jump infantry.
Consisting of a large spinal attachment with multiple power rods that can be worn on the back of a Necron's necrodermis body, a Gravity Displacement Pack allows the bearer to manipulate localised gravitic forces to achieve powered flight.
These advanced anti-gravitic devices serve a role similar to the Imperium's cruder Jump Packs. Gravity Displacement Packs are used by Triarch Praetorians to move about rapidly and hover above a battlefield, where they can survey the situation before striking to inflict maximum damage to enemy forces.
As the ultimate wardens of Necrontyr tradition, Triarch Praetorians embody the belief that the right warrior in the right place at the right time can turn the tide of battle and deliver victory.
Thus, their timely arrival on the battlefield has won many a battle for Necron forces, an achievement for which the Gravity Displacement Pack has proven invaluable.
- Codex: Necrons (5th Edition), pg. 38