Arcane Shot: Piercing Shot

You give your ammunition an ethereal quality. When you use this option, you don't make an attack roll for the attack. Instead, the ammunition shoots forward in a 30-foot Line that is 1 foot wide, originating from you, then vanishes. The Line ignores cover, as the ammunition phases through solid objects. Each creature in the Line must make a Dexterity saving throw. On a failed save, a creature takes damage as if it were hit plus additional Piercing damage equal to two rolls of your Arcane Shot Die. On a successful save, a creature takes half as much damage.