Thunderbeast's Scourge

You create six lances of blue lightning that resembles draconic beasts. These lances cackle with lightning energy and float in the air behind the caster, pointing forward, in an arc. They remain stationary behind the caster in an arc for the spell’s duration. When you cast the spell — and as a bonus action on each of your turns thereafter — you can expend one or two of the lances, sending them streaking toward a point or points you choose within 120 feet of you. Once a lance reaches its destination or impacts against a solid surface, the lance explodes and plasma scorches the ground. Each creature within 5 feet of the point where the lance explodes must make a Dexterity saving throw. A creature takes 2d6 lightning damage on a failed save, or half as much damage on a successful one.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the number of lances created increases by two for each slot level above 3rd.