Board Thread:Warhammer 40k General Discussion/@comment-25618639-20150220210346/@comment-6078851-20150331141856

i don't think the shadow in the warp would be able to smother chaotic beings into nothingness, nor if it reached the scale to threaten the gods that it would be able to destroy them. rather that the smothering effect would simply limit or nullify they're ability to do anything.

and it doesn't really matter how the shadow affects warp entities in terms of chaotic survival: if/when tyranids eat everything there will be nothing left to provide the warp with emotional essence, thus causing any warp entities to simply cease to be. tyranids have already wiped out multiple sentient species and i'd imagine that the gods would be aware of the corresponding drop-off of sentient emotional fueling. this is why i think the gods must be aware of the tyranid threat and could concievably aid the corporeal races of the galaxy with incorporeal soldiers to help fight off tyranids, but the smothering effect of the shadow will limit the effectiveness of such aid.

and yeah, once/if everything's been eaten there will be nothing left for life to evolve from - tyranids consume everything needed for organic life, elements, atmosphere, water, and all organic life. when tyranids leave desolate, barren worlds in their wake such worlds are truly barren, and tyranids have left barren galaxies in their wake.

tyranids = galactic delete button :)