Vindictive Hatred

Others may hold grudges-that does not even begin to describe the level of hatred you are capable of feeling towards a specific target that has slighted you.

• You choose an enemy you have encountered before. This creature becomes your chosen foe. The chosen foe provokes an opportunity attack from you if he enters your reach.
• You have advantage on Dexterity (Stealth), Intelligence (Investigation), and Wisdom (insight) checks pertaining the chosen foe.
• Upon slaying a chosen foe, you may choose a new foe after a short or long rest.