Scimitar of Speed

Weapon (scimitar), major, very rare (requires attunement)

• Damage: 1d6 slashing
• Properties: Finesse, Light
• Weight: 3.0 lbs.

You gain a +2 bonus to attack and damage rolls made with this magic weapon. In addition, you can make one attack with it as a bonus action on each of your turns.

Source: Dungeon Master’s Guide p. 199. Available in the SRD