This is excellent work! I realize it's aimed more at folk magic, but if it were to be used for a more traditional fantasy setting, how would you go about handling offensive spells like fireball and lightning bolt? Would it be a case of using Brew to create the spell components? Or would the GM add a new Conduit? I notice the section on Elements mentions you can add your own, but Arts and Conduits don't, so I'm not sure if they're intended to be exhaustive lists.
I mean, you can add as you like, but the pieces are already right there. Here:
The Bonfire Reborn
The Taglock for this spell is the ashes left behind from a bonfire. A pinch of these are drawn from whatever pouch, and exhorted to remember. They are then flung away as quickly as possible towards a target, as the ashes transform back into the flames of that fire for a few moments.