Acid Blast

A forceful burst of acid erupts at a point you choose within range.  Each creature in a 20-foot sphere centered on that point must make a Dexterity saving throw.  On a failed save, a creature takes 6d6 acid damage and is knocked prone.  On a successful save, a creature takes half as much damage and isn't knocked prone. 

In addition, unsecured objects that are completely within the area of effect are automatically knocked over by the spell's effect. 

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d6 for each slot level above 3rd.