Board Thread:Warhammer 40k General Discussion/@comment-25222488-20151025234507/@comment-25507520-20151221080112

Yes Tyranids don't really attack Tomb Worlds unless provoked by the Necrons, but that generally happens between the two.

Pariahs technically have no effect on the Tyranids as they have no souls either and muster their psychic power from the Hive Mind, not the Warp.

No ones saying it wont be a hard fight, but I do think they could tie in it, or that the Tyranids would win. The biggest reason is because a lot, and I mean A LOT of Tomb Worlds don't function correctly or are completly destroyed. So couple that with the fact that these are only the Tyranids equivilent of scouts and you have the death of a galaxy, souless machines or not.