The blacksmith is harboring dark thoughts... That might be a problem.
Also, even if Airen's golden greatsword feels better, I believe that, from a practical standpoint, it could use a few corrections...
=> First, the blade is too thick which can be a detriment to its cutting abilities since the edge won't be flat enough.
=> Considering the size of Airen's blade, it should have a fuller or more (the dip you can see on both sides of the blade meant to decrease the weapon's weight).
=> And lastly, the length of the hilt which in my opinion is way too short especially the grip !