Could Nids put up a fight?

Nah, Flood wreaks havoc on host cells too. Rapid necrosis followed by internal rearrangement, so the Infection Form fits better in the chest cavity. Generally most hosts we see (Brutes, Elites, Humans) are already well suited for housing the IF, and little damage will be done, but smaller creatures like Grunts and Jackals are used to create more Carrier Forms.

It was over the span of a few, I know the big name one is Silentium. The Flood basicallt show up with Precursor (Pre-Forerunner Uberfaction) tech integrated into their forces, and start stomping left and right.

>Precursor (Pre-Forerunner Uberfaction) tech integrated into their forces, and start stomping left and right
Do they operate like the hive fleets where the gravemind has separate forces? Why not keep the precursor tech?

Don't know if the Tyranids can do this but the Flood are able to take over inorganic structures like space stations extremely quickly.

They assimilated a massive alien space habitat in the span of a few weeks.

>Do they operate like the hive fleets where the gravemind has separate forces?
There's multiple Graveminds, I think.Not entirely sure, been awhile since I read up.

>Why not keep the precursor tech?
The Flood dealt with in 'Modern' Halo are a fraction of a fraction of what there was. The rest died off, with very few pockets remaining.

>I believe they would be pretty evenly matched at first but ultimatly the Nids would lose since the Flood are far more resilient and can assimilate other lifeforms much more quickly.

Nids just eat the flood, also graveminds are a form of meme at this point theyre so inflated beyond anything the actually accomplished.

The nids assimilate biological weapons meant to wipe out planets, and ones specifically meant to wipe them out.

They eat every other contender.

Nids would probably be able to detect the Thing via hivemind.

I feel like the nids would very quickly adapt their organisms to resist the flood, eventually leading to the flood being consumed. But the first few encounters would be very interesting.

I don't know how the thing works so Idk, although the hive mind would surely be able to detect any kind of mimicry.

Idk what the other thing is.

The 'Nids are pretty slow at adapting, comparatively.

villains.wikia.com/wiki/The_Ancient_Enemy
Think of The Blob only extremely smart and with psychic powers

'nids do manage to do things like steal the entire ocean inside of a few months though so I'm going to give them a tie on the terrain corruption front.

It'd certainly be messy.