Crushing Gravity

As you point with your finger, there is a drastic change in the gravity's force, affecting a 15-foot radius sphere, crushing everything within it. Each creature inside or entering the affected area must make a Strength saving throw.

On a failed save, the creature takes 4d6 bludgeoning damage, or half on a successful save, as well as gets knocked prone and loses all movement speed until the start of your next turn. Inside the affected area, all speed is halved for the duration.