User blog:Bluebeard2/Philosophical discussion concerning the nature of Necrons and Tyranids

So, I have been thinking about the Necrons and Tyranids lately. This is what I have concluded.

The Necrons hunt souls. The Tyranids feed on biomass. The Tyranids have no souls and the Necrons have no biomass, so the two armies should never actually fight each other. Also, given the Necrons are psychic blanks and have no flesh the Tyranids should not be able to detect the Necrons's presence. Theoretically, the two sides could pass right by each other and not notice.