On the subject of our BLOOD BOON:
As far as Personal boons go a reciprocal book deal seems pretty much ok. Kislev isn't literally the furtherst civilized place in the Old World from K8P (I think that would be western Estalia) but it's pretty close, so it's not like having their books copied to KAU is much of a threat to them. There's really only the matter of pride, and making the deal reciprocal will hopefully go some way towards allaying that. It is going to take a long, long time before we actually get to the point of teaching our scribes Kislevarin and actually copying any of those books, but I think we have to take the burden of doing that ourselves because asking Boris to also copy all of those books will probably hurt Kislev too much - a ruler planning to quickly modernize his mostly-illiterate country probably has some uses for his scribes, and wouldn't be able to easily spare the workforce required to copy Literally Every Book.
On that note, I went back to the update where we had a chance to copy Kislev's library and I read this description
[ ] [KISLEV] Library: Writer's Rooms of Kislev
The headquarters of the government-funded scribes for a mostly-illiterate country, Writer's Rooms boast over eight hundred years of the transcribed history and culture of Kislev.
which made me think about those government-funded scribes and how we might use them. Just commandeering them to copy all the books is too big an ask, but maybe we can use a few of them to train our scribes or teach them/Mathilde Kislevarin or something? I dunno, just throwing that out there.
But while a BOOK BOON barely makes me throw up in my mouth at all, I would still prefer something that doesn't benefit Mathilde directly. I don't know what an Empire boon would look like - the option of 'fuck Marienburg' is kind of appealing, but I don't really understand the political landscape well enough to understand the ramifications of that kind of ask. The option mentions "renegotiation of disputed borders
" - is that a thing we care about? Are there border tensions between Kislev and Ostland/Ostermark that some sort of formal treaty will solve, improving relations between Kislev and the Empire while getting Mathilde some additional diplomacy cred?
Maybe just tell the Emperor we did some Waystone related thing for Boris (full details are classified, sorry) and he owes us a solid, let him figure that one out.
I didn't see many suggetions for Order boons other than the whole "give us all your male casters" thing which IIRC has been clarified to not be a particularly great idea by a few WoGs. I can't think of any good idea myself, but I would be remiss if I didn't mention a possible way of tying this boon to the Hedgewise.
Shades of Empire mentions the Ostland and Ostermark Hedgefolk have an agreement with the Hags where each group shelters the other when they are being persecuted. I don't know if that's quest canon and if Mathilde is aware of it if it is, but if so maybe we can ask Boris to covertly use state resources to help shelter those Hedgewise and ensure they cross the border safely? Then we can ask Kurtis to let those Hedgefolk know that this new protection is courtesy of Mathilde Weber, please increase your cooperation with the Grey Order accordingly. Everyone wins! As a bonus, it's easy to believe that this concession was extracted from Boris for Waystone related reasons, possibly as part of a deal with the Haléthan Hedgewise and/or the Hag that joined the project.