Board Thread:Warhammer 40k General Discussion/@comment-25618639-20150406151006/@comment-6078851-20150406153341

i was just mentioning this on the meta-disscussion thread, as well as having mentioned it, many times, across a variety of threads, but i love tyranids so i'll mention it again :)

short answer - individual species... no. all species allied... maybe.

without the aid of daemons then i think no-one can stand against tyranids due to their method of procreation and the speed of their adaptation, as well as the fact of their numbers. plus, the unfathomable intellect of the hive-mind makes it a rarity to beat tyranids the same way twice.

but then it also depends on what you mean by 'stop' the tyranids: if you mean 'at all costs' then, once the entirety of the tyranid race is awake and within the boundries of the milky way, the necrons need only to activate huge portions of the celestial orrery thereby obliterating all tyranids. but such an action would also result in a complete destabalisation of the galaxy, which would mean that no-one wins.