Arc spear

A spear of lightning forms in your hand with 100 feet long throwing radius out from you in a direction you choose. A creature takes 8d6 lightning damage.

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 and the amount of targets you can hit with the spell for each slot level above 3rd.