Caustic Mire

You cause the ground at a point you can see within range to collapse into a bubbling pool of supernatural acid. The mire fills a 10-foot-radius, 5-foot-high Cylinder centred on that point.

The area is Difficult Terrain.

When a creature enters the mire for the first time on a turn or starts its turn there, it must make a Dexterity saving throw. On a failed save, it takes 2d6 Acid damage. On a successful save, it takes half as much damage.

Unattended nonmagical objects in the mire take the spell's Acid damage at the end of each of your turns.

Using a Higher-Level Spell Slot. The damage increases by 1d6 for each spell slot level above 2.