Unyielding Shard

You extend your finger, shooting forth an unbreakable crystal from your fingertip. Each creature in a 5-foot-wide and 60-foot-long line in front of you must succeed on a Dexterity saving throw or take 4d4 piercing damage or half as much on a success. Each time a creature fails the save, the following creature in the line takes an additional 1d4 piercing damage, as the crystal strengthens from the wound it inflicted.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 1d4 for each slot level above 2nd.