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I was wondering, what happens to worlds that have a necron presence IF they manage to defeat them (examples: Damnos, Kronus from DoW and such). I'm quite well aware that precious few battles manage to end in defeat for the necrons, but I'm asking anyway.

So, say an average civilian world turns out to be on top of a feth-ton of necrons, but fortunately an equally feth-ton of marines or something is in the area. Maybe the eldar decide to intervene while the necrons are focused on killing the humans. Maybe the necrons got bored and go back to sleep.

So the question is: The world is still usable, maybe some of the population is still alive, but the Administratum and Inquisition know that there are Necrons buried under it. Do they just quarantine it, or do they settle it with a whole boatload of rules (e.g. digging a hole more than 2 meters deep is heresy citizen).
You turn, debate.

Exterminatus, most likely - the Imperium leaves very little to chance, especially where xenos are concerned. However, many Eldar make it their mission to disrupt the Dynasties reanimation into the 41st millennium, either by setting up signal boosters on the surface to make it appear to Necron security systems that thousands of Eldar are present on that planet, or by attacking and destroying them directly. Either way, the Imperium barely knows most of the time that they are colonising ancient Tomb Worlds because of this, and often don't realise before it is too late.

If they were aware that Necrons were buried deep beneath the earth, and managed to repel them, I'd put most of my money on them blowing it to hell, and the rest on them just tightening defences if the world is of too much strategic value to lose.

G.A

Admech and radical inquisitors would try to nick all the necron stuff. Middle of the road inquisitors might try to quarantine the area of the tombs only. Imperial Lord Generals might try and pour IG into the hole until the blood stopped coming back out. Other radical inquisitors might try Exterminatus, but given that its usually a mixture of virus bombing and atmosphere damaging weapons necrons would probably just shrug it off. Probably better to drop some really big space rocks onto the site.

If they beat the Necrons then they'll blow up their tombs.

If the world is already inhabited, then they quarantine the place, remove anyone/thing of value, and watch it. Or blow it up, depending on who gets to make the call.

If the planet has not yet been settled, they blow it up.

 Flinty wrote:
Admech and radical inquisitors would try to nick all the necron stuff. Middle of the road inquisitors might try to quarantine the area of the tombs only. Imperial Lord Generals might try and pour IG into the hole until the blood stopped coming back out. Other radical inquisitors might try Exterminatus, but given that its usually a mixture of virus bombing and atmosphere damaging weapons necrons would probably just shrug it off. Probably better to drop some really big space rocks onto the site.

Or a nice,big cyclonic torpedo. Preferably, the two stage variant. Just to be sure.

Depends how strategic or important the world is. A backwater dump that was only going to be turned into another Hive World? Cyclonic bombardment from orbit. Something super important that they need to conquer? Cleanse with bolter and chainsword; See Damnos. It would have been quite easy for Sicarius to declare Exterminatus than try to retake the planet, but Damnos is too important to lose.

 Deadshot wrote:
Depends how strategic or important the world is. A backwater dump that was only going to be turned into another Hive World? Cyclonic bombardment from orbit. Something super important that they need to conquer? Cleanse with bolter and chainsword; See Damnos. It would have been quite easy for Sicarius to declare Exterminatus than try to retake the planet, but Damnos is too important to lose.

How would cyclonic bombardment work? That burns the atmosphere and kills organic life, but necrons wouldn't even notice.
More relevantly they'd have to bring in an IM fleet to crack up the crust to try to take out the tombs-as they did in previous crusades with planetary bombardment (Forgeworld Sabbat Crusade campaign book I believe).

 Frazzled wrote:

 Deadshot wrote:
Depends how strategic or important the world is. A backwater dump that was only going to be turned into another Hive World? Cyclonic bombardment from orbit. Something super important that they need to conquer? Cleanse with bolter and chainsword; See Damnos. It would have been quite easy for Sicarius to declare Exterminatus than try to retake the planet, but Damnos is too important to lose.

How would cyclonic bombardment work? That burns the atmosphere and kills organic life, but necrons wouldn't even notice.
More relevantly they'd have to bring in an IM fleet to crack up the crust to try to take out the tombs-as they did in previous crusades with planetary bombardment (Forgeworld Sabbat Crusade campaign book I believe).

Two stage cyclonic torpedo's blow the planet up.

in universe answer, if they find the tomb world, usually they go in, look around, hope not to wake up the occupants, this could be a ad mech explorator team, a dw kill team, or an inquisitor, as long as it doesn't wake up, they usually leave it well alone, if it wakes, they basically do everything they can to destroy it.

Mudrat wrote:
the Administratum and Inquisition know that there are Necrons buried under it.

The IoM might do noting for decades if centuries about it. The IoM is a stagnate rotting mess. Sure some action might be taken in the near future, but it might also be buried under some stacks of paper in an obscure part of the Administratum and the part of the Inquisition who knows about it might have their own political gains of keeping it a secret for at least a while.

There is a book called Dead Men walking where the Death Korp of Krieg is sent in to deal with some necrons on a hive world. Wont spoil the ending but its good.

 Frazzled wrote:

 Deadshot wrote:
Depends how strategic or important the world is. A backwater dump that was only going to be turned into another Hive World? Cyclonic bombardment from orbit. Something super important that they need to conquer? Cleanse with bolter and chainsword; See Damnos. It would have been quite easy for Sicarius to declare Exterminatus than try to retake the planet, but Damnos is too important to lose.

How would cyclonic bombardment work? That burns the atmosphere and kills organic life, but necrons wouldn't even notice.
More relevantly they'd have to bring in an IM fleet to crack up the crust to try to take out the tombs-as they did in previous crusades with planetary bombardment (Forgeworld Sabbat Crusade campaign book I believe).

A two-stage Cyclonic Torpedo is a "penetrator". There is a second stage where the warhead (which is basically a big melta charge) will burrow it's way to a planet's core upon impact on the surface. When it reaches it's target, it detonates, causing the planet to destabilize and possibly "shatter". This is the go-to option for worlds with no atmosphere, has Necron tombs present, and/or lacks biological life.

While Exterminatus sounds like a must, it is not available to anyone in the Imperium, and its enormous bureaucracy probably makes it hard or long to wait for someone to react on your report about a planet being a Necron tomb.

Therefore, I really like the example that is shown in DoW: SS if you win the campaign for Imperial Guard. Kaurava III is simply left alone, with just several outposts being stationed there.

 Irishpeacockz wrote:
There is a book called Dead Men walking where the Death Korp of Krieg is sent in to deal with some necrons on a hive world. Wont spoil the ending but its good.

Yeah, I have that one.
I was wondering what would have happened if the other side had won, although it appears to be either Exterminatus or Quarantine as the two most likely choices.