Transmute Earth to Acid

You choose an area of ground that you can see that fits within a 50-foot cube and is within range. This area instantaneously becomes a 10-foot deep pit of bubbling acid. Each round a target remains submerged or partially submerged, they take 4d8 acid damage, or half on a successful Dexterity saving throw. If they are fully submerged within the acid, they must roll a Constitution saving throw or begin drowning (see Player's Handbook p. 183). Targets within the acid begin to panic as their skin sizzles and melts, applying the frightened condition.