Bolt

You create a concentrated burst of lightning upon a 20ft tall and 5ft radius cylinder area centered around a target point in range. Creatures caught in the area must make a DEX save. On a failed save the targets receive 3d6 lightning damage or half as much damage on a successful save.

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