Mage – Cleanse Corruption, Steal Technology, Block Army, Scouting. Eventually, and especially for the Final Battle, you want to give Tyrion 19 Star Dragons, because the Final Battle must be fought by the faction leader (Tyrion), and 19 Star Dragons + Tyrion makes the battle a joke even on Very Hard, Very Hard. Each Handmaiden provides 10 Growth base, and you can put 3 points in Stimulate Growth, for a total of 40 Growth per turn.
1: Most of the main cities in Ulthuan have a specialty building, and a few of them offer big sums of money per turn.