Board Thread:Warhammer 40k General Discussion/@comment-25149066-20140730050740/@comment-25149066-20140730083114

The Primarchs and their Legions would be able to mulch trillions of Tyranids but remember that as of current 40k lore the Tyranids inside the galaxy are only the tip of the iceberg. The Tyranids are approaching the Imperium in trully mind boggling numbers. I bet millions of space marines, 18 primarchs, full strength Titan legions, and space fleets of fearsome fight power would blast inummerable Tyranids into sludge. Though as tough as the Imperium is the Tyranids would then start adapting to their foes. They would make new strategies to combat the Primarchs. On the other end the Primarchs are adaptive geniuses and would be making changes to their tactics at the same time.

Basically it comes down to the Hive Mind and its endless swarm of flesh vs. the Emperor and the full strength of mankind. Two forces of unstoppable power who in their very design were not meant to lose facing each other in galactic war. I don't know which one would triumph.