I like that geomancers are in the game but rather than fall under magic, I think they should fall under a different sub group: Naturists.
See, geomancers can make and shape the earth but a different direction in the subclass could be the environmentalist who, rather than farm and domesticate animals, help to cultivate forests and wildlife. Once the trees near your town are chopped down, you have to start venturing further out for wood and supplies. But, instead, have environmentalists cultivate the land (seed trees so they grow next year, protect animals so they don’t die out due to raiders and hunters, damn rivers to create pools for fishing).
Also in this subgroup could be the Stargazers that Geoffers mentioned in another forum (those who could use high built observatories to provide accurate reports on weather predictions and seasonal changes).
What do you guys think? What are some good ideas for other classes in this sub group?