The drop

You summon a singular large object including but not limited to a grand piano, an anvil, a table, or a boulder which crushes those beneath it in a 10by10 aoe. Everybody in the 10x10 area must make a dex save. On a failed save they take 4d6 bludgeoning damage and are stunned for one round. if something in the area is large it takes the front of the blow and automatically fails the saving throw but gives every other creature in the area advantage. A huge or larger creature has makes a strength saving throw. Just as mysteriously as it appeared the object disappears after one turn.