Board Thread:Warhammer 40k General Discussion/@comment-6589306-20130228113457/@comment-24944355-20150108231733

The Emperor of 10,000 years ago would have been powerful enough to disrupt the Tyranid hive mind but would not have been strong enough to destroy it. In the current time line he is potentially much more powerful but is hamstrung by still being anchored to his corporeal form which leaves him unable to access the bulk of his power. If the Emperor was able to access that power he would swallow the hive mind whole with room for desert except that to access that power he would have to die & enter the warp entirely leaving the corporeal world behind.

BTW I still have that sneaking suspicion that the Tyranid hive mind is in some way connected to Malice as they have very similar natures. I mean "the great devourer" fits Malice just as well as the hive mind and if Malice was behind the Tyranids it would instantly put him on level footing with the other chaos gods.