There is also a local Ork population in the southern jungles who quickly mobilizes against the new threats after becoming united under a new warboss. In addition, Kronus happens to be a world with hidden relics, left behind from the Horus Heresy, that are significant to the Blood Ravens and the Word Bearers Legion. Eldar from Craftworld Ulthwé soon arrive to stop the Necron threat from growing. It is also an ancient Necron tomb world, whose inhabitants are starting to awaken. An ancient Titan Hellstorm Cannon firmly entrenched in Victory Bay and the need to aid the local human population are the very reasons the Imperial Guard arrive on Kronus to 'liberate' them from Tau rule. The events of Dark Crusade take place on the planet of Kronus, a world on the eastern fringe of the Imperium, where the local human population un-easily co-exists with the nearby Tau Empire. Many Necron units have the ability to resurrect, and most will leave persistent corpses on the battlefield that may either self-resurrect after they die or be restored by specialized Necron units (this resurrection can actually allow the Necrons to go over their population cap). When fully restored it becomes mobile (albeit very slow, though it can teleport) and is armed with powerful weaponry. The Necron Monolith, their home base, is restored as more buildings are built, while also unlocking new units, and functions as the only vehicle- and troop-producing building. However, capturing Strategic Points and building Obelisks (the Necrons listening post) on them will increase the speed of research and building, and will also expand the population cap. Power is the only resource Necrons need, in order to perform research, construct buildings and to construct and reinforce squads. All units are in and of themselves free of requisition point cost.

The Necrons are unique, as they do not require requisition to build their army.

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