Board Thread:Warhammer 40k General Discussion/@comment-7123746-20130718083413/@comment-8881468-20130718164144

necrons can be destroyed, they "simply" need to be totally annihilated, molten to slag or whatnot. so it is actually quite hard.however a simple computer routine could make them seize functioning thus also ending them, whcih is cimplicated.

that said, every sentient existence save for the necrons is biomass aka: food ^^