Board Thread:Warhammer 40k General Discussion/@comment-46.162.84.254-20130704080553/@comment-4851119-20140707164615

Yeah, that's true.

Nothing in 40K that we know of (save maybe Old Ones and War in Heaven Necrons) could take down the Nids. I can see plenty of other sci-fi universes doing it (TA and Strike Legion come to mind) but 40K won't do it in 40 millenia of Sundays.