Ok I'll going to start by quoting from the Dark Elf week 2 dispatches.
Sowing discord and rebellion amongst the citizens of the Empire is of the greatest satisfaction to the Witch King and his plans to disrupt the claims of all the interested parties is beginning to take shape.
And then remind people that Tillman Spyri is a guest from Druchii.net.
Now I am not suggesting that what Tillman has quoted is not true, but we do need to consider motivations here.
From the Druchii, conflict between Empire and Asur is good. It weakens the Asur, making it easier for the Druchii to be the ones taking control of Tor Thana and other places of interest to them. It also weakens the Empire's forces allowing the Druchii to perpretrate further atrocities such as..
In the village of Egondorf in the Barren Hills a generation was taken in a single night. The town militia who kept guard over the town still lay in their beds or stood by their posts when the sunrise came. Poisoned knife wounds scored their bodies leaving them like so many grotesque statues to the horror of those who would seek to blame them for their incompetence.
At the same instant on the other side of the forest, the Annointed Kaleth led his followers in a daring raid against the fortified town of Albrechtsdorf . The town gates were locked and barred, the sentries posted to scout the edges of the forest, torches in the streets burned through the night to chase away the shadows. Nevertheless, when the dawn came families and friends found their loved ones missing with no trace of a struggle. The only evidence of any event at all was a slender elven blade left protruding from the town gate.
Now moving on the Asur goal itself. Some questions need to be answered to determine what effect that would actually have on the Empire.
Location? Tor Thana is a ruin, like all ruins prone to be a home to all kinds of denizens that wish to shun open society. In the Olde Worlde that means any of the enemies of man; undead, mutants, greenskins and worse. So would a colony of Asur be worse than this? And Tor Thana is no Imperial town, none of our citizens are being displaced.
Political significance? Asur living in Tor Thana would need resources, the Empire is clearly where they would need to get them. This could create many trading benefits. This would in turn create greater understanding between Asur and man.
Military threat? How many Asur are likely to leave Ulthuan for this new settlement? How many of them would be free from building/farming etc to practice military aims? Compare this to the armies of the Empire, in their own backyard. The realm of Tor Thana would effectively be surrounded, cut off from aid and at the mercy of the much larger Imperial armies. So it seems to me that the Asur would want, in fact need, peace with the Empire for this endeavor to succeed.
So it seems to me that in order for the Asur to succeed they would need to..
1. Clear the area of their enemies; Druchii, Greenskins, Undead, forces of Chaos etc. Which if we had enough time and men would be trying to do ourselves.
2. Agree a peace with the Empire that allows them use of the land. Opportunities for some concessions from the Asur for the Empire here.
3. Rebuild the city, needing resources and perhaps labour from the Empire. Thus trade begins.
I just do not see this as a threat to the Empire.
As Tillman says make your own judgement, but try to give it some thought. Knee-jerk reactions do us no good whatsoever.