Caustic Darts

You create three thin spikes of caustic acid that target only one creature. The target makes a Dexterity saving throw. On a failed save, the target takes 1d6 acid damage for each dart, and half as much damage on a successful save. For every set of three darts, rounded down, the target takes 1d6 acid damage at the end of its next turn. If the target succeeded the Dexterity saving throw, it takes no damage at the end of its next turn.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the spell creates one more dart for each slot level above 2nd