Alarielle's Anticipate Opening

You catch a glimpse into the near future and see your opponent's movements and strike at an opening. By casting this spell as a bonus action after making a successful melee weapon attack, you deal an extra 2d6 damage of the weapon’s type to the target. In addition, if your weapon attack roll was a 19 or higher, it is a critical hit and increases the attack's damage dice as normal. The extra damage from this spell is not increased on a critical hit.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 1d6 for every slot level above 2nd.