Weapon Magic: Thrust

You thrust your weapon with great speed and magically elongate the weapon piercing all things in a line 100 feet long and 5 feet wide in a direction you choose and then instantaneously retracts. Each creature in the line must make a Dexterity saving throw. A creature takes 8d6 magical piercing damage on a failed save, or half as much damage on a successful one.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d6 for each slot level above 3rd.