Electrocution

You extend one or both hands with fingers outstretched towards the target, jolts of lightning shoots forth from your fingertips. Each creature in a 15-foot cone must make a Dexterity saving throw. A creature takes 2d8 lightning damage on a failed save, or half as much damage on a successful one.

Any creature wearing metal armor has disadvantage on the save.

If the lightning touches water, all creatures within a 30 feet in the water are affected by this spell, but only take half damage.

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.