You hurl a bomb of acidic liquid at a point within range. The bomb explodes on impact, creating a acidic burst in a 20-foot radius sphere. Each creature in the area must make a Dexterity saving throw, taking 4d6 acid damage on a failed save, or half as much damage on a successful one.   Objects in the area take double damage from the acid, and the acid eats away at organic material, decomposing it over time. The acid persists on the ground for the duration, and any creature that enters the area for the first time on a turn or starts its turn there must make a Dexterity saving throw, taking 2d6 acid damage on a failed save, or half as much damage on a successful one.