Obelisk

An Obelisk is an air-defence construct, and an near-indestructible Necron war machine, similar in design to a Monolith, but wholly different in function and purpose. These cyclopean mobile fortresses’ function is to watch and wait for that inevitable day when a lesser race chances its army against a Necron world. They are almost undetectable whilst dormant, and are able to be sustained in such a state for thousands - if not even millions - of years, on the merest trickle of power. It is only when an Obelisk detects enemy aircraft in the skies above its Necron masters’ Tomb World, and the skies grow dark with the shadows of dogfighting flyers, does it awake to full function. By manipulating the planet’s gravitic field, they are able to rise into the air from the Tomb World’s crust, their approach swift but silent. Should an enemy aircraft stray too close, the Obelisk is able to trigger a Gravity Pulse, an expanding sphere of earth-shaking force that blows enemy out of the sky and sends the intruder hurtling to a fiery death. As such, when they rise they rise to complete dominance above the war-torn surface of their planet annihilating every enemy in the airspace around it and able to obliterate ground-based targets with its eldritch Tesla Spheres.

Armament
All Obelisks are armed with the following:
 * Gravity Pulse – When a Gravity Pulse is triggered by an Obelisk, the construct manipulates the natural gravitic fields of the planet it is on to produce an expanding wall of earth-shakingly powerful force. If an enemy aircraft is hit by this sphere of force, it inevitably is smashed aside and severely damaged, often being turned into a plummeting wreck as the pilot loses control of his aircraft.
 * Four Tesla Spheres – A Tesla Sphere is a form of Necron Tesla Weapon, and an Obelisk mounts four around its hull to provide it with a self-defence weapon capable of targeting anything around the war machine. Tesla Spheres have an extremely high rate of fire, even more so than a Tesla Destructor, and unleash bolts of living lightning that crackles from foe to foe after hitting its target, charring flesh and melting armour. Tesla bolts feed off the energy released by the destruction they cause, thus making their lightning become more furious with every fresh arc.
 * Necrodermis – The armour of Obelisks is made up of the same living metal Necrodermis that makes up all Necron bodies and vehicles. Its remarkable regenerative properties allow it to automatically repair damage to itself; whether this is the regeneration of parts of its hull, the reknitting of metal plates, and the reconnection of circuits and other delicate systems to bring its weapon systems online again.