Leveling and the Mage Sovereign
One thing I've noticed about the game that I dislike... It is much harder to level a mage sovereign than it is to level a straight warrior. The reason for this is that spell abilities generally require the use of the mana resource in virtually every battle. A lot of effort is thus required in the cities to support your sovereign by making shrines, herbalists, etc. You must turn one or two towns into conclaves and then focus on mana resources. You have to avoid ongoing mana cost enchantments as this will cut into your combat power.
Warriors don't need conclaves as much. They can just focus on getting the best gear, so that just means money which means growth. Towns for the cash and Fortresses for support.
It's important in this game to level your sovereign quickly. Sovereign level affects prestige, which affects city growth. Plus a higher level sovereign clears out areas for your cities, and can defend. So having the warrior path have a significantly higher leveling velocity... I don't think that's a good design in general.
My proposal: either have path of the mage include +1 mana/round, or have that path unlock traits that provide mana/round.