For the "Destroy all life in the galaxy so on so on..." Forerunners superweapon halo; lets start with this.
The Necrons are not living anymore. They are animated machines. Therefore that weapon is useless. Necrons can travel FTL without warp tech. Gauss flayers and all of that type, in the (war on heaven edition) could use their destructive force on anything. It did depend on the size of the beam, ect though. As for the Forerunners, although they are beings of intellect and power, may I remind all of you they were forced to enact a weapon to destroy all life in the galaxy. They could not beat the flood, no matter the fanciness of their weapons. Remember as well that A: They are in the HU, not the WH40k. They do not need to deal with chaos gods or imperium of man, so on so forth. However though, there is no implication that either side knows anything of the other. This leads to the point that necrons, which weapons are basically all designed to be one hit destruction type, will prove most powerful in the first conflict. Mainly because since necrons travel FTL without a noticeable energy signature, there is no way that any form of known scanning could catch them in time before they attacked. Forerunners may be powerful, but their tech was not designed to fight machines. Although on a scale of FR>LR(Lesser races: Humans, Covenant, ect.) their weapons might damage machines, but this is versus the Necrons. Based on what Necron ships are made of, lets assume for the moment it's not a world engine or another fancy ship.
Lets assume its one of those classic tomb world sickle shaped ones. For some reason, explained by the wonderful lore:(Mysterious unexplained technology of necron power), when these ships(And any necron one) travels faster than FTL without teleportation, it retains it's solid state. That also means its more than resistant to anything it hits along the way. This would most likely include planets, or even the FR dreadnoughts.
Now remember, alot of anything is fan based in these battles, because one person is looking for how to beat this and how to beat that.
Now lets move on to superheavy fighting. You have your solar powered forerunner weapons, (not Ark and rings, that was proven useless) your other forerunner superweapons. For what? Never before has there been a single fight where a small tombship or a singular large ship has been there. There never has been a need for it. Necron tomb worlds are nearly undetectable until unearthed, so what, maybe there's one in every thousand or so planets in the Forerunner empire. As for superheavy fights in space, once again necrons would win. Aside from the Celestial Osserary, which would allow them to literally just poke the forerunners out of existence.) You have to remember again, that necron tech isn't slow moving. Its designed to win and be done with it. They could generate pocket dimensions willy nilly, including mr time traveller's present to an inquisitor, showing that it really isn't bothersome for them. Theres large tombships, world engines, and the such.
Forerunners have hardlight, lasers, and giant beams of energy that decimate planets and such. However necrons can PHASE. meaning that all attacks directed against them are absolutely useless on large scale. The only time you actually see necron troops is defending a tomb world or for a harvest. Finally, last but not least we arrive at the issue of who would win. IMO, necrons. But I've said that. Lets go to ctan
To use the Onyx, first the Forerunners would have to detect the Ctan, use it on them. Second, the only reason the necrons managed to capture the Ctan was because they did it behind their backs with their own technology. As for WOH, they were never sealed. As for not war on heaven, they were shattered so they were still potent, but not strong enough to fight back in time to stop them from re-trapping them.
Aside from the Celestial Ossery, or the world engines, or time travel, Ctan are quite potent. Theres the deciever, who could simply cut off all communications between the worlds, making sure that they had no way to warn them of "Of all that is not steel and green scary light, there are things killing us all!" The mars dragon, which is a Ctan(pretty much canon, however last I checked it only indirectly stated it.) is how the Imperium first got ahold of alot of supertech and power. There are plenty of Ctan with enough power to destroy planets or segment reality, but hey, lets leave them out of this for now.
Lets focus on one thing: production.
Forerunners need resources, necrons kinda need resources. Necrons can repair their own armies at no cost, even if they needed to. And remember, Forerunners are living things. Therefore they are subject to all cryptek, ctan mind and necron lord mental powers. This means that they could have a monolith go FTL, appear infront of a dreadnaught, scramble anyone's brains on board before systematically destroying the ship. As for an AI run ship, They could simply shut down the power. Yes, it's that simple, necrons do have insanely advanced anti electronics weaponry which they have displayed. They also can phase. I mentioned that though. So a monolith, with a powerful energy source(All of them) could phase out right infront of one of these dreadnoughts, phase to solid form, have the portal enter vortex mode and just suck the ship in. Same goes for almost every situation. The problem is not how many there are, it's simply this. Forerunners are written from a past lore standpoint. Which means their tech is ancient and superpowerful, but it also means they lost.
The necrons on the other hand, simply destroyed most of the universe and decided to take a nap so planets could repopulate and they could kill them again.
And no, The ark and halo rings cannot destroy necron systems as they can repair themselves. Their legs can walk over to the rest of them to reattach. Their "Nervous system" is really just living necrodermis with programmable orders. The higher functioning ones are just advanced computers. As well, if it destroyed all sentient beings, then it would have destroyed all forerunner relics, as they had automated systems, which is similar to basic necron tech.
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