That was a great game for sure ! I died 2 times and then beat it yay !
The overlord was easy to beat because I had 6 basic strength (appears that I'm lucky with dice) add the warrior bonus, the battle axe and some scrolls that upgraded my weapon -> 14 damage
But still, it was awesome !
Maybe you should add some weapons for wizards and clerics though. Honestly I did not use any spell cause I had not that much intelligence in the end... (not telling that I'm silly)