acidic eruption

a green toxic spew erupts from the earth dousing the area. all creatures within the 15 foot radius must make a dexterity saving throw. On a fail saved, the target takes 5d10 acid damage immediately and 2d8 acid damage at the end of its next turn. On a successful saving throw, the eruption hits the creature with acid for half as much of the initial damage and no damage at the end of its next turn.

Using a Higher-Level Spell Slot. The damage increases by 1d10 base damage and 1d8 acid damage later for each spell slot level above 3.