Eric's Shredding Shrapnel

With one hand extended you magically compress a handful of wood, rock, or metal into smaller deadly shards brimming with magical energy while with the other hand you palm saltpeter into the shards causing them to launch aggressively. Each creature in a 30-foot cone must make a Dexterity saving throw. A creature takes 7d4 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 3rd level or higher, the damage increases by 2d4 for each slot level above 2nd.