Make a ranged spell attack against a target you can see within range that is size large or smaller. On a hit, you may push that target directly away from you up to 100 feet. The target stops moving when it encounters solid terrain (such as a wall or tree) or a creature Huge or larger, but takes no damage. Creatures (size large or smaller) in the path of the target must make a dexterity save against your spell save DC or be knocked prone.