Not using Roganna's heroic feat is a huge mistake on that map, for that encounter specifically, it might be one of the best heroic feats there is in the entire game. You literally force every enemy to either do no damage or come into melee and get squished the next turn. It allows you to then, the next turn, charge the goblins and start ganking them left and right. Minion archers usually die in one hit and the witchers die easily too and do less damage. She's a huge boon on that map, shame they misplayed that hard.
The best overlord strategy is to stay at range with all goblins doing damage from range to weaken the heroes and pick them off, using villagers to force them out from cover. Eventually you'll have them all dead or near death. Meanwhile, you stack overlord cards and once you've got a few dash cards or blinding speeds, you make a break for it. Roganna's heroic feat lets the group charge out into the middle very early, take little to no damage (or force the goblins to give up their range advantage), and lets you pressure them early before they can start whittling you down, and lets you keep them from inching forwards to make the grab. It also gets you away from the villagers early so they aren't an issue. You can't blockade them anyway because of scamper.
Edited by Whitewing, 08 May 2014 - 08:50 AM.