Magic in this country is a trade, not a title, and it comes in seven colors. A witch does not choose hers. Her hands settle into one over her first weeks of training, and the school reads the answer off her.
Brown is the most common by far — healing and growing things. Every village has one, and the world cannot move without it.
Red keeps the forges and the bakehouses.
Yellow are the messengers and the storm-callers, one in every post office in the country.
Blue are the cold-keepers, fewer than anyone expects, mostly stationed on the coasts and in the high mountains; they hold things still.
White are the lamp-witches and the night-watchers.
Black is stone and earth — the diggers and the foundation-layers, a useful color to be in a city.
Green are the wild-callers, and the fewest of all. They speak to the beasts and the beasts speak back, and a Green often goes her whole life without meeting another.