Has the thread ever considered handing the Liber Mortis over to the dwarves? Like, we've been keeping it secret and safe, but we also travel a lot and a lot of people always suspect wizards regardless of how they've proven themselves. And there's always the chance that someone skilled might take a crack at her home while she's not there. Mathilde has already read it, and I don't think we ever intended to use it beyond learning how to focus down enemy's weaknesses and improve our understanding of magical theory.
Gunnars is a member of the Order of the Guardians right, the ones who fight the undead? And K8P is becoming more of a stronghold every year, with deep vaults and protections. He and his order can hide it away, only to be brought out for emergencies like another vampire war or for his order to better understand how to fight undead.
I say this because at this point I trust the dwarves of K8P more then any other power in the Old World, and as much as Mathilde remains loyal to her college and the Empire (especially now that she's the heirs godmother), I think she'd think the same. Loyalty and trust aren't the same thing, and and I trust our new friends to never abuse it as I wouldn't trust the colleges or the religious orders.