You've learned to use a whip at its maximum potential, you have become extremely precise and deadly with it. You gain the following benefits:

• When you succeed on an attack roll with a whip at its maximum range, the damage die increase to 1d6.
• You can use your action to grapple a non carried object or a creature that is one size bigger than you or lower with the whip at its maximum range. You use an attack roll with a whip instead of an athletic check for that grapple attempt.
• After you attacked with a one handed weapon, you can use your bonus action to attack with the whip.