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Usually this wouldn't happen in the case of a 'Dead world' since Tyranids are attracted to life. Then again so are Necrons since they seek to snuff it out. Also, it's not uncommon for Necrons to already exist on a colonized word without the locals knowing anything about it. Tyranids strike - suddenly the Necrons rise up from their slumber.
My question then is, what would happen if the Necrons did clash with Tyranids? And more importantly what would each other's motivation be? Scenarios anyone?
I don't think it would matter much for the Necrons, for one. If they were beaten, it wouldn't be the big tragedy like it is for the Imperium where they lose good men and women in battle against an unstoppable alien race, mainly because they can just teleport back to some random tomb world/factory and repair themselves to fight again. They have no motivation to fight the Tyranids since they will be around when all of the other races have died out, but they do make good harvesting because of all the organics running around. If the Hive Mind were something sentient it would be another matter, because then it would understand the threat posed by the Necrons if the Warp was sealed off (No more synaptic control, the Tyranids eat each other into oblivion) but since this is not the case, I doubt the races have any sort of special interaction with each other beyond Kill All, Burn All, Destroy All.
Indeed, the way I see it the Tyranids are more 'living' than anyone else out there - so the Necrons would want to harvest them good. I wouldn't mind seeing that, though would the Tyranids even 'detect' the Necrons as they were fighting them? Since they aren't alive I mean.
It doesn't really matter once the Tyranids are in battle. The whole thing about Necron tomb worlds being ignored is because there's typically no usable biomass in the first place. Once they're actually on the planet, if the Necrons rise up and start attacking them, their survival instincts would probably kick in and they'd start defending themselves.
Aye, Tyranids are not "life-sensors." They're not bound and determined to kill living matter and living matter only. They simply gain the most from it. They kill tanks when they want to, yatta yatta. As far as we know, they can make use of metals too ... biomass is their main target, but there's nothing in the fluff that says they can't digest and use the elements from metallics. Imagine Tyranids getting laced with living metal. Well, probably a bad idea ... C'Tan would have a field day ...
True tomb worlds with no life on them would probably get ignored, but they'd have to be genuinely barren rocks. The 'Nids got no problem absorbing an uninhabited world with minor plant and animal life along the way, since the only energy they lose is some heat energy in the process. Either the Necrons wouldn't even notice, or they would and the fighting imaginably would commence ... unless the 'Nids just felt like leaving.
Nids & Guard
GMail = MVBrandt
The Hivemind is certainly sentient, possibly more so than the C'tan. It's sentience is based on a very different perception of the universe. The Hive mind see's a worlds defenders a nothing more than germs. By comparison Necrons are no bigger in it's view. The Hive minds interests are in the bigger picture, eating the whole galaxy and attacking in such a way as to try to get the whole thing.
Would they or would they not be able to resist a Tyranid attack is another matter. The Necrons, Tyranids and thier masters the C'tan and the Hivemind are all something out of each others experience. Basically they probably haven't seen one another before. It is possible the Tyranids have seen C'tan though or the C'tan's distant relations.
The Tyranids have destroyed thier own galaxy and possibly others. The C'tan were beings who were born around the start of time etc, there is nothing that says they are limited to one galaxy. It is possible that the Tyranids have seen C'tan before in thier home galaxy and possibly others. That these C'tan did not or could not stop the Tyranids destroying thier own harvesting grounds does not make things appear to favour the C'tan in the long term.
A fight between the Necrons and a Tyranid Hive fleet would depend on the obvious, how big is the Hive fleet, how many Necrons are there. Also would the Tyranids move on the Necrons or have other targets a life-rich moon to eat for example. Allowing the tyranids to exploit such as thing would most likely be the end of the Necrons, once Tyranids are allowed to begin reproducing and evolving they do so very quickly and would soon overun any defences. Even big old tombworlds.
If on the other hand the Necrons decided to move quickly they could prevent the Tyranids reproducing in huge numbers. Typically when encountered if Tyranids are left to do what they want this is the doom or near doom of those ignoring them, Iyanden is a good example of being poorly prepared and believing oneself to be untouchable. Moving quickly to deal with them provides much better but very costly results. Taking into account that Necrons take several thousand years to get out of bed they might encounter problems.
Arguably, they are better equipped to fight them though aren't they? Being all steely and using their gauss flayers and whatnot. Though I do see the issue of them being quite slow in confronts to the Tyranids.
Necrons do not seek to "snuff out life", they seek to enslave and harvest its energy, just as Tyranids seek to devour it. To use a mathematical formula:
Everything else=big juicy field of corn.
When locusts approach that field, the farmer gets angry. The results can be...messy.
The C'tan have waited millenia to reconquer the galaxy, and I find it hard to believe that they wouldn't be concerned over the Tyranids devouring their food.
As for the results of a Necron/tyranid war, the Necrons would probably win (in the long run) by using the strategy of biomass denial. They're even less squeamish about annhilating entire worlds just to starve a few tyranids than the Imperium.
Actually, your logic there seems counterintuitive.
If they would fight the Tyranids to prevent worlds being devoured, I doubt they'd destroy those worlds to do it.
On a technical level, the C'Tan don't much care what form the biomass/energy is in (Though they have taste preferences) ... no idea if the Tyranids are "tasty" or not.
Nids & Guard
GMail = MVBrandt
Well as it is, the Necrons are functionally immortal and can travel anywhere in the galaxy without a moment's hesitation due to their zero-inertia drives. What's a few worlds when you could feed on the entire universe? Now having said that, we don't know just how large the Tyranid race is so a war between the Necrons and Tyranids could go on forever and ever. Neither race has yet revealed their full powers either.