Blade of wind

You evoke a blade of wind in your free hand. The blade is similar in size and shape to a scimitar but no one other than you can see it , and it lasts for the duration. If you let go of the blade, it disappears, but you can evoke it again as a Bonus Action.

As a Magic action, you can make a melee spell attack with the blade. On a hit, the target takes bludgeoning damage equal to 2d6 plus your spellcasting ability modifier.

Using a Higher-Level Spell Slot. The damage increases by 1d6 for each spell slot level above 2.