I think the problem is everything up until this battle was a cakewalk, regardless of character spec. Potions? Pfft, only if you felt really pedantic. Armour sets from the flying fortress? Who needed them, basic legendary stuff got the job done. The game REALLY needed to amp the difficulty level up smoothly to this fight, actually make you think about what you kit and what you spec.
I really wish it had. I would have loved to immerse myself in the whole battle tower/runners/training deal, but I really didn't need to. Damnit! Great game, though, great game- totally ODed on it for a week. Bloody endgames in these euro RPGS always bite: RISEN was a disgrace, too.