Yow.
After Matt made clear at discord that you are flirting with the idea of adding sorta demon doors to the game (Twitter), it was literally brewing in my head. :)
I think I finally have a nice idea to offer.
Since you are going to make a game filled with "a mix of British folklore, ancient legend, and rustic traditions" and also accentuate it with celtic-ish UI-elements, you could also make use of the Celts in this case.
The Celts were very fond of the nature, as you may know.
Long story short: They had special spots where special trees where "living", (some of them are still to find here and there, the oldest ones are in GB, yew-tree's up to 4000 years old) and it was not permitted to cut them off, therefor they had "comercial"forests. Anyway.
Just think of hidden spots spreaded around Quill were really old trees are living. They may talk to you or throw their fruits to make you recognize,heh. I think you get the idea...
Cheers