A line of ice crystals 30 feet long and 5 feet wide forms from your location in a direction you choose. Each creature in the line must make a Dexterity saving throw. A creature takes 2d4 piercing damage and 2d8 cold damage on a failed save, or half as much damage on a successful one. On a failed save the target's movement speed is also reduced by 10 feet until the end of their next turn.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the cold damage increases by 1d8 for each slot level above 2nd.