Game`s difficulity. Am I missing something??

[aghiuta]

Use the frog princess wife and don't have any kids with her. After a while she turn to frog and gives 100% attack to snakes and spiders. Stock up on the three types of snakes available + priests and inquisitors and attack the undead castle. I killed him at lvl 9. The snakes will block the ghosts and the 100% attack really helps.
Invest everything in leadership (try to upgrade the items giving leadership).
And do note that some things are random every time you play.