Homebrew
Lightning Bolt
2-level Evocation
Casting Time: 1 action
Range/Area: 120ft
Components: V, S
Duration: Instantaneous
At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 1d6 for each slot level above 2nd.
At higher levels: You hurl a bolt of lightning that arcs in a straight line 5 feet wide and 120 feet long. Each creature in the line must make a Dexterity saving throw. A creature takes 4d6 lightning damage on a failed save, or half as much damage on a successful one.