You've gained even more skill with a whip.

When wielding a whip, when you take a grapple action you can attempt to grapple a creature 10 ft. away from you. Make a Strength (Athletics) or Dexterity (Slight of Hand) check vs. a Strength (Athletics) or Dexterity (Acrobatics) check of the target. (They get to choose which check they use). You cannot use the whip to attack while a creature is grappled this way. You can loose the grapple as a free action.

While mounted, as a bonus action you can crack your whip to add 10ft of movement to your speed.