Ancient Celts had two-handed swords, even when they encountered the Romans. So, it's not technologically impossibly for an iron-age culture could produce such things. Of course, Finns are not Celts, but then again they are not the folk of UnReal World either. I guess the only question is whether it matches Sami & Erkka's vision of UnReal culture. Personally, I like the battleswords. But, if they were removed, it would give more reason to focus on Axe skill instead of Sword - since the battleaxe would be the only 2-handed melee weapon, capable of cleaving armor and dealing decisive, catastrophic damage to any body part