From what I've seen, the hero is really good early on, as the top comments suggest, but later on he's rather weak. If you remember in the previous Epic Wars you lost if your castle was destoried. So pretend your hero is a castle and do NOT have him fight or die. Instead, use your minions to fight instead of your hero, melee units up front, ranged in back. Ranged units seem to have the greatest impact in my opinion as melee units die too fast, basically cannon fodder. I gave my ranged units more power and my Centaurion the Portable Mjolnir because he throws spears that hit more than once. When it comes down to ranged units vs. ranged units, use a spell to kill them. Remember to use buildings to prevent your enemies from getting by. Really great game by the way, only done 2 of the trails but ill keep at it. Best of luck :3
I dont know if this has been suggested... but could you add a map of some sort so I can find the effing quest target? I'd wonder randomly having no idea where its at...