So I barely beat Dugog after an hour of retries on easy when I was lvl.15 and he was lvl.18. Honestly I just think he was fucking cheap as hell with his 20% chance to do 18 points of damage every time he matched skulls + extra turn everytime he matched any gold (which meant A LOT) + his super high HP + some of his crazy spells. I had 30hp once and he had 1hp and he did some all screen spell and killed me >_<
I like the rest of the game where the enemies level with you, but I don't like set level bosses.
Also I realized I don't know why I picked a mage. My HP always sucks and maybe I'm missing something but I don't have any zomg spells. I mean fireball is nice for 6-7 damage here and there and wall of fire can be a good defense, but I'd rather just have a dude with high HP who does a lot of damage each time he matches skulls.