Cracked Crater

You leap into the air and slam your fist into the ground. The earth buckles and cracks into a 20-foot deep cube crater centered on you. Each creature in that area except for you must make a Dexterity saving throw. On a failed save, a creature takes 3d12 bludgeoning damage and is knocked prone. On a successful save, a creature takes half as much damage and isn't knocked prone. Additionally, the ground within the crater becomes difficult terrain until filled. Each 5-foot-square portion of the area requires at least 1 minute to fill by hand.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d12 for each slot level above 3rd.