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i have read about the deceiver absorbing cypher's knife. I wanted to know if it is possible to utilize necron weaponry against the necrons themselves. do they absorb it or suffer the same damage?

That's only because the knife is made out of the same material as the C'tan. The Knife is a C'tan Phase weapon, yes? There was a similar scenario in the 3rd ed book, where a Callidus assasin tried killing a governor, who was really the Deceiver in disguise. The sword just got absorbed. His words were something like, "How nice it is for children to return home". There was even a rule where if you tried attacking a C'tan with a c'tan phase weapon, that model loses the weapon permanently.

Also, Necrons are not the same as C'tan. To reference the 3rd codex "you mistake the master for the slaves" (this is out of date, considering how the roles are reversed, but it's the same idea.)
Despite also being made out of necrodermis, Necrons do not appear to be able to absorb C'tan phase weapons as well.

They should not have immunity against Tesla or Gauss, due to how such weapons work.

The shard of the Deceiver is probably a special case, but in general necron weapons work fine against other necrons. without the silent king or an enemy to rally against, The various dynasties spend a fair amount of time fighting each other.

This was a C'tan phase knife (C'tan phase blades being made of the very living metal that C'tan them selves are embodied in)- essentially Cypher stabbed Clayface with a knife made from Clayface.

There's nothing to suggest that necron weapons are inefficient against necrons- guass guns strip matter, necrons are made of matter.

This isn't star trek where you modulate your shield frequency to repel attacks with ease or calibrate your phasers to pass through the shield harmonics.

I can imagine a scenario where a faction was happily employing a necron device they had found when a Necron lord regained remote control of it.
Since lots of imperial tech would be based on the dreams of the Dragon on Mars, its not inconceivable that the Necrons could seize control of that too.

That's why the Imperium largely relies on Servitors and meat-brain machine spirits so that they cant be infected by data daemons.

ok, this all seems to make a lot of sense. thank you guys very much. I was considering a novel where an iron hands astartes rips the glaive out of a lychguard's hands and uses it to fight. is that possible or does the weapon phase out?

I am pretty sure the whole c'tan phase sword business got retconned along with the changes to the c'tan and necrons.

 Cursed Founding wrote:
ok, this all seems to make a lot of sense. thank you guys very much. I was considering a novel where an iron hands astartes rips the glaive out of a lychguard's hands and uses it to fight. is that possible or does the weapon phase out?

Seems strange that the weapon would stay active in the Marine's hands.
(some?)Marine bolters have dna sensors so they can't be used by the enemy- you;d imagine xenos would have something similar.

Perhaps the weapon remains active so long as the necron is active? If he's injured but hasn't phased out, the weapons may still work.
Phasing out may have a range too. When a necron phases out his equipment phases with him- but perhaps there's an upper limit to that- if the gun is a mile away it might not work.
You'd assume that the necron himself has the phase out recall bits and bobs and the weapon is merely keyed to phase out with him- otherwise the Imperium wouldn't have any necron gear at all.

Also consider the fact necron technology is incredibly advanced, it may not be possible for him to use it. I read somewhere that it took the power of a whole ad-mech planet to fire a single shot from a standard gauss rifle..... if its a weapon entrusted to the bodyguards of the lords one would imagine it would be almost impossible to use by anyone other than the lychguard?

I'm not too sure considering their weapons are designed to combat the Eldar and the Old Ones. I'd imagine they work on each other just fine.

The Glaive is a metal stick. Marines are quite strong. What else needs to 'work' here?

Indeed. Beating the lychguard to death with the sharp end is still possible, even if the power field fails.

And he can definitely take it off him; the 'phase out' system is somewhat imperfect anyway - there are occasionally necrons casualties who fail to phase out (or who are prevented from doing so - deathwatch anti-phasic bolts, for example).