For people saying "this isn't worth Vlag's Boon" - well, it probably is. It's been discussed over the last few days, but ithilmar is apparently worth
way more than Mathilde realised, and she got absolutely rinsed in the deal with Laurelorn (Read: Boney was working off of a vague source elsewhere for calculating value, and a more specific recent source he's taking as canon for the quest puts it at much more expensive.)
Spending a Transcendent Boon actually is quite possibly the only way we'd ever be able to afford a suit of ithilmar armour.
There's also the fact that no one's come up with any good ideas for using the Boon. We thought about using the Rhunkit for the Project, but it turns out dwarven Runesmiths aren't really a bottleneck on the Project the way we thought they might be. People have suggested getting them to help reinforce Kislev against the next Everchosen, but there's no way they aren't already going to be putting every effort into resisting Chaos in the most efficient way possible; it'd be robbing Peter to pay Paul. And, more than that - a Boon should be something for Mathilde, not on geopolitics.
The fact that we haven't spent Vlag's Boon
eleven turns later demonstrates just how much Karak Vlag doesn't have anything we need, or even particularly want. Spending it to use its access to the greater Karaz Ankor to get the best suit of armour possible is a fine use for the boon. Heck, with the possibility of adding runes, I'm quite excited about what we might get.
There would apparently have been (scant?) change out of our Ithilmar deal with the Eonir if we'd asked for an Ithilmar mail shirt in exchange instead of books.
That would also have been just a mail shirt, not a whole set of plate armour. All of the ithilmar we could gather in the Empire didn't amount to much more than that.
This seems like a plan to acquire something that may- possibly with a lot of luck and good will- hope to approach the Von Tarnus armour and it's unique ability to stack with AA for nigh-invulnerability, but also paying extra in the Transcendent Boon?
I'm not looking to replicate Von Tarnus' stacking with AA, but having a different enchantment - or runes - is plenty valuable. And it's not paying "extra", Von Tarnus' armour would be paid for by two massive magical discoveries - and more to the point, it's not winning the vote, sadly. It's not on the table.