A bright white streak of frost flashes from you to a point you choose within range and then blossoms with a loud shattering sound into an icy explosion. Each creature in a 20-foot-radius Sphere centered on that point makes a Constitution saving throw, taking 8d6 Cold damage on a failed save or half as much damage on a successful one.

If a target fails its save, its speed is reduced by 10 feet until the start of your next turn.

Using a Higher-Level Spell Slot. The damage increases by 1d6 for each spell slot level above 3.