You’ve learned to perfect your wielding of the whip, granting you the following benefits:

• Increase your Dexterity by 1, to a maximum of 20.
• You gain profeciency in the performance skill.
• You gain profeciency with the whip.
• When wielding a whip you can use  your bonus action to grapple creatures using it.
• When wielding a whip it's damage die is a d6 instead of a d4.
• When you score a critical hit with the whip you get advantage on your grapple against that creature.