Lightning Leash

You create a whip of crackling electricity and crack it outwards at a creature you choose that you can see within 30 feet. Make a melee spell attack. On a hit, the target takes 1d6 lightning damage and is ensnared by the lightning leash. If the target moves outside of the spell’s range before the start of your next turn, you can use your reaction to yank on the leash. The target must succeed on a Strength saving throw or take 1d6 lightning damage and have its speed halved until the start of your next turn. Once it is outside of the spell’s range, the leash dissipates.

Both damage rolls increase by 1d6 when you reach 5th level (2d6), 11th level (3d6), and 17th level (4d6).