Coin Scattershot

You cause two coins to collide within your firearm, firing a spray of lightning and coin shrapnel out the barrel. Each creature in a 15-foot Cone makes a Dexterity saving throw against your spell save DC, taking piercing damage on a failed save or half as much damage on a successful one.

The damage is three of the damage die of the loaded coin: 3d6 for copper or 3d8 for silver.

Using a Higher-Level Spell Slot. The damage increases by 1d6 when using copper coins, or 1d8 when using silver for each spell slot level above 2.