Oppressive Force

Your mere presence on the battlefield prohibits your enemies' options in combat, while expanding your own, when you take this feat, you gain the following benefits:

• Whenever you kill an enemy with an opportunity attack, you regain your reaction (once per turn)
• If you hit an enemy with an opportunity attack due to them making an action/bonus action, they must make a concentration saving throw or lose that action/bonus action
• Enemies have disadvantage on attack rolls on your allies while within 5ft of you
• You take 1d4 less damage from all sources for each enemy within 5ft of you, the maximum amount of d4 you can have is equal to your proficiency modifier