Quick Blade Proficiency (5e Feat)

Prerequisites: Dexterity 13, proficiency in finesse weapons.
You have gained a better understanding of using lightweight blades to your advantage.

When you attack an enemy for the first time you gain an advantage on the attack roll. For this attack, your critical hit becomes 19-20. You may use this feature as many times as your proficiency bonus modifier per short or long rest.
If an enemy attacks you with the one-handed weapon you may use your reaction to parry the weapon. The dc for this ability is 17 as you proceed to roll a d20. If you succeed you may roll a d4 and remove the amount of damage from what you would take. You may use this feature as many times as your proficiency bonus modifier per long rest