Harry Potter - Secrets of Hogwarts

You create a long, snaking whip of fire from the tip of your wand, lashing out and coiling around a creature in range. Make a melee spell attack against the target. On a hit, the creature takes 4d10 fire damage and is grappled for the duration. As an action, the target can make a Strength or Dexterity saving throw to end the spell's effects. On each of your following turns spent maintaining dedication, the whip tightens and you deal 4d10 fire damage to the target automatically. If the creature is Large or smaller, you can use a bonus action to pull the creature up to 10 feet closer to you.