Tesseract Ark
The Tesseract Ark is one of the most powerful (Read:Fucking bullshit with enough cheese to make an Italian proud!) Necron war machines that is considered highly mobile. It is a highly sophisticated design produced only by skilled Crypteks and it is predominantly built around a contained singularity torn from the heart of a dying star, and in battle it siphons energy from this source to unleash devastating firepower from its Projector Array. Essentially this thing has a god damned black hole launcher as its main gun, it would have been Awesome if it wasn't for the fact that it is yet again, part of a already buffed beyond logical reasoning army while others such as the Dark Eldar, Sisters of Battle and Tyranids are in serious need of support here.
The Ark itself is surrounded by a gravitational distortion field, which is both its method of movement as well as a defense mechanism which makes the Necrons have their own Holo-fields. Which we stress again, is fucking ridiculous even for the Necrons as this turns it into a one man army wrecking ball of death and destruction.