Caustic Splash ( greater than lvl5)

As an action you can produce a reaction causing a caustic acid to form. At a point within 30 feet, you can a toss quick combination of reagents that will cause a splatter of acid in a 5 foot diameter.

Creatures in that area have to make a Dexterity saving throw against your Spell Save DC, or take 2d4 acid damage. Damage from this acid deals double damage against structures and objects.  The acid remain in the that location until the end of your next turn when it is no longer caustic.  Any creature that ends its turn in the acid also takes damage.

The damage damage increases by 2d4 when you reach 5th level (4d4), 11th level (6d4), and 17th level (8d4).