Acid Jet

 A blast of acid erupts from your outstretched hand in a 10 feet wide, 100 feet long jet. Creatures in the cone must make a Constitution saving throw or take 12d4 acid damage. On a successful save creatures take half damage. Creatures that fail the save take an additional 6d4 acid damage the following round. 

Any creatures killed by this spell melt into a toxic sludge with all non-magical items also melted. 

At Higher Levels. When you cast this spell using a spell slot of 6th level or higher, the damage increases by 2d4 for each slot level above 5th.