Decisive Striker

You are clever and tactical when planning your strikes during martial combat and your knowledge allows you to know how best to wound a creature.

• Increase your Intelligence score by 1, to a maximum of 20
• On a melee attack roll that you hit of 20 or higher, you can add your Intelligence modifier to the total damage of your attack
• You gain advantage when attacking a creature concentrating on a spell within melee range

Credit to u/Lucciious