This spell does not have a direct equivalent in vanilla.
Vitriolic Sphere
Level: 4
School: Conjuration
Range: Medium
Duration: Special
Casting Time: 3
Area of Effect: Target, and anyone within 10’
Saving Throw: Breath half
When this spell is cast, a glowing orb of emerald acid streaks to the target and explodes in a 10-foot radius. Each creature in the area must make a save vs. breath. On a failed save, a creature takes 10d4 acid damage and 4d4 acid damage at the end of its next 2 rounds. On a successful save, a creature takes half the initial damage and half damage at the end of each round.