Electric Wave

As you hold your hands with fingers spread, a wave of electricity shoots forth from your outstretched fingertips. Each creature in a 30-foot cone must make a Constitution saving throw. A creature takes 3d8 lightning damage on a failed save, or half as much damage on a successful one.

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