Electroweb

You hurl a lattice of crackling electrical energy toward creatures within range. Choose up to two creatures you can see within range.

Each target takes 1d6 lightning damage and must succeed on a Dexterity saving throw, on a fail its movement speed is reduced by 10 feet until the start of your next turn.

DC = 8 + your Proficiency Bonus + your Dexterity Modifier

On a successful save, a creature suffers no reduction to its speed.