Played a game to about 250 turns yesterday and ran into a game breaker when trying to attack Kraxis' main city.  The city was defended by Kraxis, his spouse, 2 children and a few guards.  The problem is that 1 of the kids is undamageable.  She resists all magic as well as physical attacks.  The unusual part is that she is not dodging or blocking physical attacks but 'resisting' them.

My guess is that she perhaps has spell immunity cast on her, but due to a bug, this is also making her immune to physical attacks.  End result is that the city is untakeable since that 1 unit is unkillable.  Tried auto resolve also to see if that might get around it but it doesn't.  Even though she has only 2 atk she will take down my army of level 5-6 champions simply because they can't hurt her.

Other than that, kudos to the dev team, the game is really shaping up nicely.  I am enjoying the pacing much more now and the AI is starting to make some 'smart' moves.  Keep it up team!