You fling a shard of ice at one creature within range. Make a ranged spell attack against the target. On a hit, the target takes 2d8 cold damage. Target must make a dexterity saving throw or it's speed is reduced by 20ft

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