Deadeye

You can use your willpower to strike with supernatural accuracy. When you make an attack roll, you can use your Bonus Action to gain a +10 bonus to the roll. You make this choice after you see the roll, but before the DM says whether the attack hits or misses.

You can use this ability once per combat encounter. To take this feat, you must be able to use at least one Martial weapon with proficiency, be 6th level, and must have a Strength or Dexterity score of at least 14.