Artifice Sword (5e Equipment)
From D&D Wiki
Weapon (longsword), rare (requires attunement)
This blade is of godlike craftsmanship, made from a supernaturally lightweight material, and specializes in parrying and deflecting blows. While wielding this longsword, you can add your Dexterity modifier to attack and damage rolls instead of your Strength modifier. When you hit with this longsword, you deal an additional 1d8 damage, or 1d10 damage if you wielding it in two hands. The damage from this weapon is not magical.
If you are wielding this sword and not benefiting from a shield, add a +2 bonus to your AC.