Thunder Arrow Barrage

generates a electric field around the arrow, until the electricity consumes the arrow becoming uncontrollable and you must do a Wisdom saving throw to control it.and separates into  4 smaller bolts that deal 8d1 lightning damage. Once the lightning hits an object it causes 8d6 lightning damage.  Each creature must take a Dexterity saving throw. A creature takes 8d6 lightning damage on a failed save, or half as much damage on a successful one.

The lightning can ignite flammable  objects in the area that are not being worn or carries.

AT HIGHER LEVELS: when you cast this spell using a spell slot of 6th or higher, the damage increases by 1d3 for each slot level above 5th.