Sanctuaries and Patrons, what are they for?

[Kurt]

... though I haven't suggested potential Boons they might grant.

That's the real trick/challenge; still providing different enough Boons for each Patron as their potential number increases.

I like the idea of a boon from patrons Rich, that's pretty cool.

Would you have those boons localised to the area that the patron has knowledge of or influence over, or global? So for example having Balin as a patron

Balin
Dwarven Trail Lore: Whilst travelling in the Northern Dalelands, The Wastes or the Upper Marches, when rolling Lore to plan a journey your character may roll the Feat Die twice and apply the highest result.