Tactician

This feat is created by Nedrapter for use in his Land of Arda campaigns, and are balanced to the hardcore nature of them. 

• Increase your Intelligence or Charisma score by 1, to a maximum of 20.
• A number of creatures equal to your Proficiency Bonus of your choice have advantage on initiative rolls.
• When another creature that you can see within 30 feet of you makes an opportunity attack, you can use your reaction to give that creature advantage and +5 to the damage roll. If the attack misses, you regain your reaction.