Crystal Weapon

You coat your weapon in many small clusters of shimmering crystals. On your next attack with the weapon, creatures within a 15-foot cone from the creature you target must make a Dexterity saving throw, or take 2d8 piercing damage as the crystals launch forward.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the piercing damage increases by each spell level by 1d8 for each slot above 2nd.