Eldritch Whip

You can keep your enemies at bay with a whip. You gain the following benefits:

• When you take the Attack action and attack with only a whip you can use a bonus action to make a melee attack with the backstroke of the whip. 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 piercing 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. 
• The whip damage die now increases to a d6 instead of a d4