With respect to the idea that Morghur's aura means any use of magic will instantly turn anyone trying to cast into a chaos spawn, that's not really true.
So as far as the relative risk of casting magic goes, we can be pretty confident that casting magic where we currently are won't instagib Mathilde unless Cor-Dum is at least a little closer than the edge of the forest - given the fact that the forest is surrounded by desert (with clear sightlines), if we can't see him than whatever passive "fuck your spellcasting" aura he has is highly likely not to reach us.
I don't remember seeing hard figures for roughly how much of the crater is taken up by forest, but if the forest covering the bottom third of the mountain from sight also means it covers about a third of the distance from the mountain to the crater then the upper bound for Morghur's passive aura is ~2/3rds of the entire crater at a time.
In other words, if from our vantage point we see Cor-Dum moving off to one side of the crater (say, to go fuck up some attacking Kurgans), we can reasonably believe that using magic outside of the crater and on the opposite side of the crater from him would also be unlikely to instantly turn Mathilde into a chaos spawn.
[X] Fortify here and see if anything interesting happens over the next day
[X] Approach the Kvellige camp peacefully and attempt to discuss the Karak with them
I'd like to see if we can get a little more information on Morghur's aura before running in on what seem to be ~coin-flip odds (Morghur's passive aura can't cover more than 2/3rds of the crater, and approaching from the opposite side of the crater would increase chances both through sheer distance and through being in the shadow of a mountains worth of magic-resisting stone), but even if we don't uncover anything new by waiting/watching I think I'd be willing to take the coin-flip.
I'm also willing to put my money where my mouth is re: my thinking on Morghur's aura (with the proviso that this is sticking around at the crater's edge, rather than moving further in on infiltration).
[X] Volunteer to test Morghur's reputed ability to turn anyone using magic nearby into Chaos Spawns
We know for a fact that the range of Morghur's aura has an upper bound of "from the edge of the forest on our side to the lip of the crater", because Mathilde was channeling Rite of Way right up to the lip of the crater and didn't turn into a chaos spawn.The mostly flat landscape starts to grow rugged as you approach the foothills of Karag Dum, and nervousness gives way to anticipation in the atmosphere of the steam-wagons. You stay quiet, occupied with the dark mutterings you heard from numerous sources about what fates might have befallen Karag Dum, and what lengths they might have gone to to avoid them. The temperature has been steadily falling as you ventured further north, but here it grows hotter and drier as the ascent continues. You pass tattered banners hammered into the bare stone of more varieties than you can identify, most seemingly Kurgan, some completely unfamiliar to you, and others completely wiped clean by the hot, gritty wind that seems to be blowing directly into your face. And then the Alriksson crests a final rise and the landscape opens up before you, and you barely manage to release the Rite before shock tears it from your grasp.
You'd seen pictures of Karag Dum, the tallest of a small cluster of mountains approached through an exposed vale. But now it stands alone, jutting out from a great crater that you find yourself on the lip of. Directly below you is bone-white sand, interrupted regularly by actual bones that grow thicker on the ground the closer it is to Karag Dum. And with shocking abruptness the desert gives way to disturbingly familiar forest that now rings the base of Karag Dum, burying the bottom third of it in apparently primeval forest that by all accounts was not there a mere two centuries ago. And as you stare and as the Alriksson continues trundling forward, you see a figure at the edge of the forest, standing taller than a man and taller still when you consider the skull-adorned frill that juts from its skull.
In a flash of realization, you know why your question had confused the Yusak Shaman. When he spoke of Dum, he did not mean the Dwarfhold of Karag Dum.
He meant Cor-Dum.
So as far as the relative risk of casting magic goes, we can be pretty confident that casting magic where we currently are won't instagib Mathilde unless Cor-Dum is at least a little closer than the edge of the forest - given the fact that the forest is surrounded by desert (with clear sightlines), if we can't see him than whatever passive "fuck your spellcasting" aura he has is highly likely not to reach us.
I don't remember seeing hard figures for roughly how much of the crater is taken up by forest, but if the forest covering the bottom third of the mountain from sight also means it covers about a third of the distance from the mountain to the crater then the upper bound for Morghur's passive aura is ~2/3rds of the entire crater at a time.
In other words, if from our vantage point we see Cor-Dum moving off to one side of the crater (say, to go fuck up some attacking Kurgans), we can reasonably believe that using magic outside of the crater and on the opposite side of the crater from him would also be unlikely to instantly turn Mathilde into a chaos spawn.
[X] Fortify here and see if anything interesting happens over the next day
[X] Approach the Kvellige camp peacefully and attempt to discuss the Karak with them
I'd like to see if we can get a little more information on Morghur's aura before running in on what seem to be ~coin-flip odds (Morghur's passive aura can't cover more than 2/3rds of the crater, and approaching from the opposite side of the crater would increase chances both through sheer distance and through being in the shadow of a mountains worth of magic-resisting stone), but even if we don't uncover anything new by waiting/watching I think I'd be willing to take the coin-flip.
I'm also willing to put my money where my mouth is re: my thinking on Morghur's aura (with the proviso that this is sticking around at the crater's edge, rather than moving further in on infiltration).
[X] Volunteer to test Morghur's reputed ability to turn anyone using magic nearby into Chaos Spawns