@boomquad: easy: just need golem, some other melees to hold him (=> the white tiger) and a lot of ranged (=> those spearthrowers and mages you get in the beginning). just make sure your ranged stay out of range for him
this game does have a few bugs in it. sometimes i can't close formation screen, and sometimes when i start a battle you can hear the music but i still see the continent...
i think the second hero is the best, at least with her attack. The regeneration spell is good also, just give her an hp accessory and she will be fine as long as she has regeneration
best way to win is upgrade maneuver to 16, having plasma and drone upgraded max and if you can't kill the guy in these 2 extra turns, buy yourself a shield and some armor
upgrading energy and cooldown is good also