system
Given the following post, respond as if you're commenting on Reddit:
human
[WARHAMMER 40K] How can the Tyranids ever beat the Necrons?

Let me set up this situation for you. The Tyranids we have seen were only the scouting units, and once the full fleet came through they murdered every other living species. In order to fully take over the Milky Way they need to wipe out all the Necrons. How can they do it?
gpt
The Necrons are static, even more convinced of their technological superiority than the Eldar. They are socially fragmented, arrogant, and most of all, damaged. Not a single Tomb World is at 100%, and even Imotek's world of Mandigora has it's glitches. 

The Tyranids, on the other hand, are dynamic. Battle after battle they adapt and change, becoming stronger. Each victory or loss, they learn and adapt. They would eventually create the perfect weapon against the Necrons, who themselves seem unable to develop anything new. Their last creation was the Tomb-Blade, and those are millions of years old. 

Through numbers and their ability to adapt, the Tyranids would eventually win. Most importantly, though, all Tyranids are united.