The result: finished the Mystics Vale map on 19 days, Heroic Difficulty
My strategy: Really simple:
Get the skeleton archers from the dwelling, extra hero, and external dwelling
Buy all three warmachines
Go to war... reinforcements on the way

of course I played against the computer player... but I think any human player would have trouble against this
See the result for yourself:
the final battle: day and oponent:
[img=http://img58.imageshack.us/img58/2628/scrnshot011206150252rr7.th.jpg]
[img=http://img133.imageshack.us/img133/251/scrnshot011206150257og1.th.jpg]
the caracteristics of my hero:




final battle:


the final screen:
[img=http://img134.imageshack.us/img134/9520/scrnshot011206150746ah6.th.jpg]
kind of strong isn't it....