The pve crons actually could work as opponents to regular crons. They would come in the form of the empire of the severed. The empire is a group of emped crons that got taken over by a rouge necrontyr AI that seeks to turn this tomb world as well. It uses shit tons of canoptek constructs to make it so pve cron fights aren't just continuous cron stompfests. They would work as follows: -flensing/attack scarabs: The swarm element, they can do massive damage to people/vehicles, but have no hp. They would be the version of the guants. -Wraiths: The CQC enemies. They are deadly in close combat and utterly wreck most things. The melee unit. -Aranchites: Flying enemies that cover the aerial vector. Necrons equivalent of gargoyles in this sense, they were made by forgeworld IRL. -Canoptek Spyders: Ranged support/spawner. This unit is good in melee and has a canon on it. Its main use would be to spawn more scarabs, so you would need to take it out fast. -Warriors: Elite ranged units. Final wave strong guys. -Flayed ones: Powerful melee units that scare the hell out of everyone. -Destroyer cult: Due to their attitudes, mobility, and strength, I could see these guys as a final wave boss.