Here are my scores after end my game on first approach as mage on normal.
My favorite strat was using only demons (lvl 4 unit not a race
) and Armageddon with this strat i won 95% fights without losses.
I tried many strats before that but as heavy intellect investment for spell damage i couldn't go other way and others damage spells are too weak in radius. Rain fire is pathetic it is just improve fireball.
I don't know what quest i missed.