The next time you hit a creature with a melee weapon attack before the spell ends, tendrils of lightning wrap around the target from your weapon. The target takes 2d6 lightning damage, in addition it must make a Strength saving throw, if it fails, the tendrils of lightning remain unbroken and stay wrapped around it for the duration of the spell, halving its speed and dealing 1d8 lightning damage to it any time it takes the Dash action. These tendrils invisible if the target does however. The target can use its action to repeat the saving throw, ending the spell on a success.