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So, they can cut through anything, but if they strike a C'Tan, they get absorbed. So what happens if they strike each other, has this ever been documented? Do they weirdly mesh together, do they both break, or do they do the lightsaber thing?

The origin of that story is old Cron. It is unclear if the same would happen with new Cron.

In the original story tt is unclear what causes it to be absorbed. Usually I would assume that the bigger mass would absorb the smaller mass. But maybe the ctan could exercise some will over the material. Old Cron ctan had a lot of freely powers. (I would recommend the Dawn of War necron level for examples of this.)

Well….nobody knows. Right now, it’s not even clear if the C’Tan Phase Sword is still weaponised Living Metal, and not simply another type of Necron, or even Necrontyr, weapon.

 Tawnis wrote:
Do they weirdly mesh together, do they both break, or do they do the lightsaber thing?

They twist together like in Spaceballs

Hitting necrodermis (Necrons) doesn't result in them being absorbed, so presumably a C'tan (or at least C'tan's necrodermis) is a factor in absorption.

Old crons where crazy gods. And crazy good. It was implied that the old nightbringer was such a manifestation of death or an avatar of death that he projekted death and dread to others around him. It was never very clearly stated but it was highly implied that these where almost like the consept death. (It was probably putting the cart before the horse in that explanation. It was more like on Hitchhikers Guide through the Galaxy Criket is such a dreadfull thing it has projektet itself to every living thing. Or like the gods and the yozai/unborn in the Exalted RPG.)

How ever that was old Cron. New Cron do not seems to be implied beeing tied to universal consepts. And if they where they are just buggered all as shards and prisoners of the necrons.

Old ctan cool. New ctan lame, but it gives the necrons more individual personality.

 Tawnis wrote:
So, they can cut through anything, but if they strike a C'Tan, they get absorbed. So what happens if they strike each other, has this ever been documented? Do they weirdly mesh together, do they both break, or do they do the lightsaber thing?

I'm going to hazard a guess and assume that the will of the C'tan is a factor. The Deceiver in the 3rd ed codex did mockingly say that it's "good for one's children to return," implying that it was his intent that the blade got absorbed.
It could be that without a C'tan nearby to manipulate the blade, they'll just clash against each other like normal swords.

 Tawnis wrote:
So, they can cut through anything, but if they strike a C'Tan, they get absorbed. So what happens if they strike each other, has this ever been documented? Do they weirdly mesh together, do they both break, or do they do the lightsaber thing?

It's like crossing the streams in Ghostbusters.

 CthuluIsSpy wrote:

It could be that without a C'tan nearby to manipulate the blade, they'll just clash against each other like normal swords.

Did a little more reading on this, in what tidbits I could find around the interwebs. From what I understood, the blade can phase in and out of reality, that's how they bypass armour (yeah I know, there's a lot of issues with that logically, but ignoring that for the moment). I THINK that would mean that if neither phase, they act like regular swords, and if one phases they pass through each other, but if they both phase... would they just clash again? It's really unclear what phasing out even means or to what point it does so. I mean, so it phases through armour, but not the flesh underneath?

 Tawnis wrote:

 CthuluIsSpy wrote:

It could be that without a C'tan nearby to manipulate the blade, they'll just clash against each other like normal swords.

Did a little more reading on this, in what tidbits I could find around the interwebs. From what I understood, the blade can phase in and out of reality, that's how they bypass armour (yeah I know, there's a lot of issues with that logically, but ignoring that for the moment). I THINK that would mean that if neither phase, they act like regular swords, and if one phases they pass through each other, but if they both phase... would they just clash again? It's really unclear what phasing out even means or to what point it does so. I mean, so it phases through armour, but not the flesh underneath?

Well, that's what wraiths could do. At least, in 3rd ed, back when they were proper necrons instead of canopteks.
They would phase into people's bodies and remove their organs, leaving a hole where the organ was. It happened to some girl on a ship attacked by necrons, and it baffled the investigators as to what killed her (as there were no wounds) until they did an autopsy.
Phasing means it moves to another dimension that's not this one but close to it. Think ghosts. A lot of necron tech does that.
Necron science is weird and creepy, don't worry too much about it.