Is the sword description saying +60/65 damage, or is that the effect when you equip the weapon? When duel wielding in DKS, the effect of damage enchantments on each weapon are applied to both (and magic damage bonuses/enchantments on weapons are applied to spells, including each missile in a cast of Magic Missile).
I didn't pay attention to swords in DKS (playing an archer), but you may have just got a lucky randomly generated item. The sword in the chest near Lovis is a set item, and always has a level 7 Increased Damage enchantment (+30 damage), plus a damage bonus if you are wearing any other Blood Echelon set pieces.
When I finished Maxos temple I got a random bow in the list of quest rewards with level 8 Increased Damage (+50). You can buy a bow with Increased Magical Damage 4 (+12) from the blacksmith, but there are no pre-set items with higher levels of that enchantment, and I didn't make note of where/when I found higher levels.
Do you have the
patch installed, or an already updated release / download version?
In the original release of some versions of the game the changes to the enchantment system could result in some high damage bonuses on low level equipment. In that case, though, it was getting something like 40 or 60 damage at character level 3 or 4.
