Swallowing Earth

You target one point within 50 feet of you and transform the ground into quicksand. Any creatures in that area of effect has to make a dexterity saving throw against your spell save DC or be sucked into the quicksand and as a result take 3d6 force damage and 2d4 acid damage. The creature repeats the saving throw at the end of your turn to exit the area. Any creature that starts their turn in the area takes the damage.