So here's my guild thus far. While not necessarily a guild in the traditional sense of the word, it still functions as an organization and it's desire to find and preserve knowledge would allow its members to interact with other's throughout the course of the roleplay. Maybe some necromancer or some such wants to use Eldritch knowledge or an old ritual tome to take over the world, well the Watchers would definitely get involved. Not just to take the knowledge from said villain, but help save the world so there's a steady stream of new knowledge to collect.

And I know there's no advanced technology in this, and I've sort of given a reason for that in my WIP sheet here, but these guys do have some magitech. Though the most advanced stuff is keeping the Athenaeum in pristine condition while lesser items and devices are used by those who leave it to go back to Vrenorza to collect things. Anyway, let me know if it fits or not.