You create four glowing spheres in an unoccupied point within range that crackle with lightning and hover a few feet off the ground. Each ball is Small and doesn't fill its space. When you cast the spell and as a bonus action on your subsequent turns, you can move one or more of the balls up to 20 feet. A creature that touches a ball of lightning or comes within 5 feet of it while wearing metal armor or carrying a metal weapon or object causes the ball to explode. All creatures within 5 feet of the ball must make a Dexterity saving throw, taking 2d8 lightning damage on a failed saving throw, or half as much on a successful one. The ball lightning than vanishes.
When the spell ends, the remaining balls of lightning wink out of existence harmlessly. If a ball of lightning travels further than 120 feet of you, it also vanishes.
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