Well I would not say we are ruined. We would be in deep shit, but neither the Grey College nor the Bursar would enjoy it because:
Thane of Karak Eight Peaks, Loremaster of Karak Eight Peaks, Court Wizard of Karak Eight Peaks, Dawongr, Azrildrekked, Dawizhufokri
And on top of that:
Dawi (apparently)
Mathilde is not just a Lady Magister, she is someone who can leverage almost unfathomable amounts of Dwarf rep. I suspect that (and our distance from the Empire) is a good portion of the reason why the Bursar is being so hands off.
Eh, they can ruin us, ruining is not killing. If we are an oathbreaker and that is provable, the Dawi will be... very disappointed and angry at us. We'd have to go slayer or we'd get killed, and if we escape we are practically in exile from both Empire and Karaz Ankor.
If they have reason to censure us, they'll have to kill us subtly enough not to tip off the Dawi.
Unfortunately we're talking about the Grey College, so that won't be particularly hard for them.
That said, I think actually killing us will be a lot harder. These people are peers and they are also drowning on AP hell, we can give them the slip for a long while and we are better at close combat and dispelling that most mages (although I wouldn't make either bet against another LM if I didn't absolutely have to). Moreover, if we had nothing to lose, we also have necromancy. They can ruin us, sure, but killing us is up to the dice, and I do not think the circumstances are that favourable to them (unless they decide to focus on us with multiple high profile assailants despite the AP hell, then our odds will be very bad... then again, necromancy IS op, so even that may still only even things out)
That said, I really, really do not want us to find ourselves in a scenario when we learn what those dice'll be. I do not care if I am right on wrong, I believe I speak for the vast majority of people* here when I say that we should do everything possible to not even learn the odds of surviving the grey college declaring us an oathbreaker.**
*love you too
@Omegahugger , you awesome exception, you.
**If they do it one sidedly, without either a trial or truly undeniable and waterproof evidence, we can spin it on the Dawi that they are wrongly accusing us, which would most likely be believed. That would be a very different scenario. I doubt they do not know that, though, the Bursar, as Boney said, is very experienced.