Tactician's Storm Bolt

A stroke of lightning forming a line 100 feet long and 5 feet wide or a forked bolt forming a line 50 feet long and 10 feet wide blasts out from you in a direction you choose. Each creature in the line must make a Dexterity saving throw. A creature takes 8d6 lightning damage on a failed save, or half as much damage on a successful one. If the bolts hit an unyielding surface (such as a stone wall) before reaching its full length, it reflects off at an angle equal the the angle it hit at (like light on a mirror) and go for its remaining length. A creature caught by the bounce must make a saving throw as per the original parameters. A creature can take damage from this spell no more than twice total (so original and one bounce, or two bounces possibly).

The lightning ignites flammable objects in the area that aren't being worn or carried.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d6 for each slot level above 3rd.

This is to bring a bit of the flavor of the classic AD&D Lightning Bolt back to the spell, and make it an actual alternative for 3rd level instead of Fireball, Have Fun Adventurers!