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

What if it was like this?

Haven - Air and Earth
Conflux - Air and Fire
Necropolis - Earth and Water
Sanctuary - Water and Air
Academy - Fire and Earth
Fortress - Fire and Water
Stronghold - Earth and Air

not a bad option

Added 2 hours 12 minutes ago
I would probably make the magic schools like Dyrman's, but swap the magic of Haven and Conflux, but you can take his option completely, WizardNazyr, if you have other options, suggest them.