Agron’s Lightning Arrow

A crackling bolt of lightning streaks toward a target within range. Make a ranged spell attack against the target. On a hit, the target takes 4d6 lighning damage and must make a Constitution saving throw. On a failure, the target is stunned until the end if its next turn. On a hit, the bolt can jump to one additional target within 10 feet.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the bolt can jump to one additional target within 10 feet of the previous target per spell level.