Ice Knife
Source: Xanathar's Guide to Everything
1st-level conjuration
Casting Time: 1 action
Range: 60 feet
Components: S, M (a drop of water or piece of ice)
Duration: Instantaneous
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 the point where the ice exploded must succeed on a Dexterity saving throw or take 2d6 cold damage.
At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the cold damage increases by 1d6 for each slot level above 1st.