[Edi]

Fire, Endo. You need Fire magic for base mages, though it should be minor. Fire is one of the most important elements in Finnish folklore. It is the basis for all of our myths about house elves/gnomes (haltiat). The original haltia was a fire spirit, which would spring into being wherever a fire was lit and it would have an appearance akin to whoever made the fire.

This morphed into the kodinhaltia when settlements became permanent, but the kodinhaltia was liked to the fireplace of the house. I read a book on our folklore (actual research into it, not just a collection of myths) and within the geographical boundaries of Finland, there are mentions of hundreds of different spirits, with over two hundred names for fire spirits alone.

So just put F1 on the common mages, though the best the nation should get with fire mages is F2 at the most aside from Ilmarinen.