Board Thread:Warhammer 40k General Discussion/@comment-46.162.84.254-20130704080553/@comment-4851119-20140710153226

The thing is, to defeat the Nids you need considerably better tech than anyone in 40K has in terms of resource scarcity and construction - you have to be able to set up a sizeable military complex and combat force in hours with only the barest warning, you need to have effectively infinite resources and energy on hand because you have so many Nids coming that you're going to be fighting for a long time, you need to be heavily reliant on automatons for combat, construction and damn near everything so as to have as little biomass as possible in the line of fire from which they can replenish their losses... the list of very, very demanding required factors goes on and on. Time-manipulation and reality-warping superiority aren't musts but they'd be damn helpful.

Really, you need to look past 40K to the extreme high ends of sci-fi to find something that can challenge the entire Nid swarm - Total Annihilation, Lensmen, Skylark, the Culture, that sort of level of absurdity.