Regarding the transcendent boon, perhaps it can be used to alleviate the Slayer Problem.
I mean, it would be like slapping a fish to that one Slayer Hold but a boon that says 'this super awesome person that retook the Karak Eight Peaks asks that those dwarves who cannot fulfill their oaths anymore to look for another way to make their ancestors proud' would probably entice some dwarfs to not
die dye their hair orange but look for anything else to do, even drudgery. So long as hope exists and all that, which we've already proven.
@BoneyM is Mathilde's boon different from the other wizards? Considering she arguably planned and was instrumental the whole retake all Karaks in a single day thing. Who else received the boon other than the wizards?