Blizzard of Javelins

You create twelve javelins of ice that orbit within 20 feet of you at incredible speed. The ice javelins move with you and grant you immunity to cold and fire damage, and all ranged weapon attacks that pass through the area automatically miss for the duration. The cold freezes nonmagical liquids within 40 feet of you that aren’t being worn or carried.

Any creature that starts its turn within 20 feet of you or enters the area for the first time on its turn must make a Dexterity saving throw. On a failed save, the creature takes 5d12 cold damage and 5d12 piercing damage. On a successful save, a creature takes half damage. All creature's speed is halved in the area, except your speed.

You can use a bonus action to send one of the ice javelins streaking toward one creature or object within 150 feet of you. When you do so, make a ranged spell attack against the target. On a hit, the target takes 5d12 piercing damage. Hit or miss, the ice javelin then explodes. The target and each creature within 20 feet of it must succeed on a Constitution saving throw or take 5d12 cold damage on a failure, half damage on a successful save. The javelin is expended when used in this way. The spell ends early if you expend the last ice javelin.