PHB
Acid Arrow
2-level Evocation
Casting Time: 1 action
Range/Area: 90 feet
Components: V, S, M
Materials: powdered rhubarb leaf and an adder's stomach
Duration: Instantaneous
A shimmering green arrow streaks toward a target within range and bursts in a spray of acid. Make a ranged spell attack against the target. On a hit, the target takes 4d4 acid damage immediately and 2d4 acid damage at the end of its next turn. On a miss, the arrow splashes the target with acid for half as much of the initial damage and 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 damage (both initial and later) increases by
1d4 for each slot level above 2nd.