Electroswing

You channel a constant lightning crackling around your body. Upon the casting of this spell and on subsequent turns, you can use your action to release lightning in a 15-foot long, 5-foot wide line extending out from you. Each creature in the line must make a Dexterity saving throw. On a failed save, creatures take 4d8 lightning damage, or half as much on a success.

Additionally, any creature that hits you with a melee attack takes 1d4 lightning damage per hit, and nonmagical ammunition that hits you from ranged weapons cannot be reused without repair.

You can end this spell early as an action, and doing so deals 5d8 lightning damage in a 30-foot long, 5-foot wide line.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d8, and the line increases by 5 feet in length for each spell level above 3rd.