Lord Hasmosteph the Resplendent is equipped with a resurrection orb and a staff of light, and you can use him to represent a Lord or even a mighty Overlord within your Necron dynasty of choice. They are possessed of formidable cunning and martial strength, and the resurrection orbs they carry to war can overcharge the self-repair systems of nearby Necrons. The Royal Courts of Necron dynasties also include many lesser lords amongst their number, while fringeworld forces may even be led by such beings.
Yet it is the Overlords' indomitable wills that are perhaps their most fearsome assets, for with these they drive entire armies to war. Their android minds are tremendously swift, their bodies implacably resilient and their weapons eldritch, ancient and lethal. Overlords lead the Necron dynasties in battle.