RTF is a global modification that replaces all towns in the game.

I would probably make magic schools like Dyrman did, but I would swap the magic of the Haven and Conflux factions.

Give fire to the Haven? People used to worship Silat – the dragon of air. And earth is what gives life to the empire: plants, etc.
The desert (where the elements rage) is fire and air (heat from the sand and scorching air).