Whin's Thunderous Thralls

Wafting through the air, six small thunder clouds appear and float around the caster's head. They float in the air and orbit you 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 thunder clouds, sending them streaking toward a point or points you choose within 120 feet of you. Once a thunder cloud reaches its destination or touches a solid surface, the cloud reverbverates a thunderous boom. Each creature within 5 feet of the point where the Cloud ruptures must make a Dexterity saving throw. A creature takes 2d6 thunder 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 thunder clouds created increases by two for each slot level above 3rd.