1) Escaping

One of the very precious units of AI escaped from a battle leaving behind 13 pioneers When i clicked autoresolve however, the unit that has already escaped got killed

Another thing: those who escape from a battle in which i conquered a city appear in my city after the battle, although when i attack them and win again my army appears outside of the city 

2) Balance issue

War Magic is useless except Touch of Entropy which is extremely strong - if not for this spell i will never be able to win battle against AI who fields 40-60 armor units (in fortified cities)  ... AI should target my mags capable of casting that spell first (and they would die in an instant), instead of focusing on my heavy armored troops 

3) Crystals

I cannot harvest crystals and i am well advanced in the game. I am given contradictory informations: cannot be used by our faction, or that it requires technology we don't have. Which technology is that??? I am playing Yithril.

4) Strategy

I have had cases where some units leave the city walls and attack me outside, though they have no chance in winning and in the end also army inside in the city is weaken to the point i could conquered it.

bartek

PS I enjoy challenge, though it is rather due to ridiculously high stats of AI troops (120 health, 40 attack, 50 armor - a wife everyone would like to have) rather then opponent's strategy.