Volt strike

When you cast the spell, choose a point you can within range. At the end of your next round, a lightning bolt shoots from the ceiling or sky to that point. Each creature within a 5 foot diameter cylinder centered on the lightning bolt makes a Dexterity saving throw, taking 4d12 Lightning damage on a failed save or half as much damage on a successful one.

If you’re outdoors in a storm when you cast this spell, the originates from that storm. Under such conditions, the spell’s damage increases by 1d12.

Using a Higher-Level Spell Slot. The damage increases by 1d12 for each spell slot level above 2.