Bladesong Smite

The next time you hit a creature with a weapon attack before this spell ends, the weapon glows with magic threads as you strike. The attack deals an extra 2d10 force damage to the target, which becomes visible if it is invisible, and the target is covered by magical threads that glows dim light and can’t become invisible until the spell ends. 

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the extra damage increases by 1d10 for each slot level above 2nd.