You create a shard of ice and fling it at one creature within range. Make a ranged spell attack against the target. On a hit, the target takes 1d10 Piercing damage. Hit or miss, the shard then explodes. The target and each creature within 5 feet of it must succeed on a Dexterity saving throw or take 2d6 Cold damage. Using a Higher-Level Spell Slot. The Cold damage increases by 1d6 for each spell slot level above 1.
Ranged spell attack for piercing; then target and each creature within 5 ft make a DEX save vs the cold burst. +1d6 cold per slot above 1.
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