Bigbys Foot

A incorporeal Foot appears and smashes on the Ground. Each creature in a 15-foot-radius sphere centered on that point must make a Strength saving throw. A creature takes 5d8 Bludgeoning damage and is knocked Prone on a failed save, or half as much damage on a successful one. 

A nonmagical object that isn't being worn or carried also takes the damage if it's in the spell's area.

You may Flavour this Spell however you like in Appearance but make sure the DM makes a pleasing squishing Sound when it gets cast

At Higher Levels. When you cast this spell using a spell slot of 6th level or higher, the damage increases by 1d8 for each slot level above 5th