You have mastered the ways of the whip and the intricacies of such an exotic weapon. You gain the following benefits:

• When you take the Attack action and attack with only a whip, you can use a bonus action to crack the whip and make a quick, secondary melee attack. This attack uses the same ability modifier as the primary attack. The weapon’s damage die for this attack is a d4, and it deals  slashing damage.
• While you are wielding a whip, other creatures provoke an opportunity attack from you when they enter your reach.
• You may add your proficiency bonus to ability checks and attacks made to disarm enemies when using a whip as a part of the check or attack.