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Ok, so who will win? A Tyranid force, or the replicants?

If you don't know, the replicants are a sentient race of nano-machines from Stargate, who are capable of breaking down any material they come across, and then they use said material to produce more themselves.

If you want details, let's just its a world occupied by replicants that get invaded by the nids.

replicants obviously since they will use the said material faster and replicants can covnert any material not just biomass and i dont believe tyranids have molecular weponary ( if someone could correct me on that it owuld be swell).
unless the hivemind messes up with the replicants communication system.

I'm pretty hazy on the exact mechanism of how replicators work, but I think that when they convert biomass it stops being biomass, and becomes mechanical. So for the Nids, it would be like fighting the Necrons, where winning a battle gets you no biomass other than the troops on your side that fell.

But surely the Nids will defend themselves? And they don't only go after biomass. They go against all resources I'm pretty sure. Just look at the pyrovore. That thing is designed to break down metals.