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For some reason I seem to remember in the lore, that Tyranids tried to avoid areas with heavy Necron population due to something with the C'Tan messing with the Tyranid hivemand? Maybe the Necrons awoke in a neighboring galaxy and are driving the nids out?

Note, this would have been around 4th edition era....I've really not kept up om 40k lore outisde of the Space Marines :(