1. Tyranids are anti-psyker, not anti-Warp. There is a difference. The Shadow in the Warp does nothing, at all, to a Daemon that has already manifested. A sufficiently powerful Pariah can kill a Greater Daemon, with its presence alone. And the Tyranids are not capable of severing the Materium from the Immaterium, something the Necrons CAN do, even now, they are largely the reason why the Eye of Terror has not grown.
There is a huge difference.
For example the SiTW spans lightyears and cuts off astropathic communication, shuts down psykers completely, and is inherent to the entire swarm rather than just pariahs.
The Tyranids have no need or reason or want to do that. Also, it should be noted they don't feed the Chaos gods, so upon wiping out the other races they will weaken and atrophy anyway.
You're missing the point however, that this is a role they lifted from the Tyranids. Before the Necrons, Tyranids were the anti-warp race, it was their signiature thing.
Let's also not move the goalposts, I'm arguing that thematicly they are very similar to the Tyranids, not that they are exactly the same, operate the same ways or do the exact same things.
2. Yeah man cutting out the part of my post that really mattered, specifically that they do this to other races, such as humans, harvesting specific glands, and then just kind of leaving. That kind of shit is something no other faction does. Not to mention, that came before I started listing their thematic features.
I figured since I was /only/ drawing similarities that were in your post already I could use that one. If you want me to list similarities you left out I can provide a much longer, more comprehensive list.
3. What is "enigmatic" about "OMNOMNOMNOMNOMNOMNOM"?
Gross oversimplification.
The Tyranids pose a lot of questions and to the other races are a very large unknown. Where do they come from? How did they come to be? Why are they here? Why are there feral creatures in the galaxy that already bare their genetics? Their true numbers are unknown to the imperium, as is the nature of their mind. In the earlier codices they were played up as psuedo-abominations and horrors... Kind of like the Necrons. They don't do random bullshit like only harvesting your spleens, sure, but that isn't required to be 'enigmatic'.
They are unknowable and inhuman, beyond the scope of our understanding, and are intentionally designed to play out like miniature cosmic horrors, complete with driving you insane. All that talk about chittering and scratching and millions of screeching alien voices inside of peoples heads ftw, right? And isolating worlds with the shadow before drowning them in tides of bodies so vast they can be seen from space is some pretty terrifying shit.
Also, to be frank, the average Necron Warrior, makes the average Tyranid Warrior look like a joke in physical implacability.
As of 5E. In 4th ed, mortally wounded Tyranids would continue to operate, animated by the hivemind's implacable will alone. Cruddace sort of took this from us, but I largely ignore the 5th ed codex. 😐 Now that you're getting one you can see why, haermm
And in will, no other faction compares.
Tyranids. 😐 Sure, the gaunts don't survive, but they expend trillions of the damn things just to waste your ammo without a second thought, and just like the Necrons, they lose
nothing in doing so.
4. No, dude, seriously, I was responding to him saying all Necrons have as a drive is to kill everything, why are you even saying this?
My argument is not that the Necrons drive is only to kill everything. I am mentioning they are very alike the Tyranids. The Tyranids drive is not to kill everything, either, but both would do so if successful. What I am saying as the Necrons are not so unique.
The [Tyranids/Necrons] are a highly advanced, terrifying enemy known for purging entire worlds of all life. They indomitable, implacable, unstoppable, and cannot be negotiated with. Worse still, taking casualties in battle does nothing to slow or stop them. The only way to truly damage their numbers is to destroy their [source of biomass/tombworld]. They are designed to inspire fear, with bodies strongly resembling things troubling to the psyche of humanoids such as [insects/skeletons], and cause psychic disturbances in their enemies. They are also capable of manipulating the genetics of other beings, creating [genestealers/pariahs] from the other races to bolster their numbers.
The vast majority of their numbers are made up of mindless, soulless, killing machines that know neither fear nor mercy, which advance ceaselessly until their enemies are [destroyed/overrun], and are lead by a [consciousness/set of beings] incomprehensible to men with an agenda unknown to the other races.
I could carry on, but you get the idea.
Oh, and before I forget, Tyranids are afraid of Necrons, Hive Mind is afraid of the Outsider, hyuckhyuckhyuckhyuck.
Not only is this never said, the Tyranids have no reason to fight Necrons since there's no biomass to be had.