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'''Obelisks''' are enormous [[Necron]] war engines specializing in air defense.  ==Overview==Able to remain dormant beneath [[Tomb World]]s for millions of years, when these craft can remain virtually undetected as they can be maintained on the smallest trickle of power. Once awakened by either automatically sensing enemy aircraft or intentionally by their Necron creators , the Obelisk rises from the earth and levels out far above the surface, blasting enemy aircraft out of the sky with its [[Tesla Sphere]]sShould an enemy aircraft stray too close, the Obelisk will then trigger a grav-pulse, an expanding sphere of force that shorts out their systems. Once the skies are clear, the Obelisk will descend and act as a mobile artillery piece able to engage targets, utilizing a [[Gravitic Pulse]] against enemy ground forces.{{Fn|3}}