Vitriolic Sphere

Level 4 Evocation (Sorcerer, Wizard)

Casting Time: Action
Range: 150 feet
Components: V, S, M (a drop of bile)
Duration: Instantaneous

You point at a location within range, and a glowing 1-foot-diameter ball of emerald acid streaks there and explodes in a 20-foot-radius sphere. Each creature in that area must make a Dexterity saving throw. On a failed save, a creature takes 10d4 acid damage and another 5d4 acid damage at the end of its next turn. On a successful save, a creature takes half the initial damage and no damage at the end of its next turn.

Using a Higher-Level Spell Slot. The initial damage increases by 2d4 for each spell slot level above 4.