You have honed your skills with a whip to their peak, allowing you to have more benefits to using one than the average person:

• You gain proficiency with whips.

• Attacks made by you using a whip can be made out to a distance of 15ft instead of the usual 10ft
• You can make a grapple check from a distance of 10 feat while wielding a whip.
• While wielding a whip and another creature hits you with a melee attack, you can use your reaction to add your proficiency bonus to your AC for that attack, potentially causing the attack to miss you.