Source: Tal'Dorei Campaign Setting Reborn

Weapon (longsword), legendary (requires attunement by a bard)

This incredible silvered blade once belonged to the legendary White Duke, a founding member of the Golden Grin, and many other master bards before him. It resonates with nearby musical tones. In the modern era, it is best known as the personal weapon of famed bard Scanlan Shorthalt.

Dormant. While Mythcarver is in a dormant state, you gain a +1 bonus to attack and damage rolls made with this magic weapon. This longsword’s enchantments and light construction also grant it the Finesse property, which allows you to use either your Strength or Dexterity modifier for the attack and damage rolls when making an attack with this weapon.

Additionally, when you target an ally with your Bardic Inspiration feature, you gain advantage on attacks with this weapon until the end of your turn.

Awakened. When Mythcarver reaches an awakened state, you gain the following benefits:

• The weapon’s bonus to attack and damage rolls increases to +2. Additionally, when you hit with an attack using this weapon, the target takes an extra 1d6 force damage.
• When you use your Bardic Inspiration to affect an enemy while wielding this sword, that enemy has disadvantage on their next saving throw.

Exalted. When Mythcarver reaches an exalted state, you gain the following benefits:

• The weapon’s bonus to attack and damage rolls increases to +3.
• As an action, you let the spirit of the sword overtake your body and guide your strikes. You make 4 melee attacks with the sword, then gain 1 level of exhaustion. Once this property is used, it can’t be used again until you finish a long rest.