With a snap of your fingers a swirling burst of freezing wind erupts at a point you choose within range. Each creature in a 5-foot-radius sphere centered on that point must make a Constitution saving throw. On a failed save, a creature takes 3d8 cold damage and becomes stuck in the ice, reducing their movement speed by 10 feet until the start of your next turn. On a success, the target takes half as much damage and is not stuck in ice.   The ground in the area is covered with slick ice and snow, making it difficult terrain until the start of your next turn