Coiling Volt

You create a powerful electric charge on yourself and suddenly discharge it. A bolt of lightning fires off you and targets the closest creature to you within 30 ft of you. The creature must make a dexterity saving throw against your spell save DC. On a failed save the creature takes 2d12 lightning damage or half as much on a failed throw. If multiple creatures tie for closest roll at random to see which creature it targets. Constructs and creatures wearing metal armor make the saving throw at disadvantage.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the damage increases by 1d12 for each slot above 1st.