You have practiced and used a certain set of actions in combat so many times they have become ingrained into your subconscious mind and your body is able to perform them with little or no input from you.
When you use the attack action for at least 2 turns in a row you may attempt to activate this ability. As a bonus action make a DC14 Dexterity check. On success, for the next 3 turns you are able to to make an extra attack when you take the attack action. On failure, you expend an attempt and nothing happens. If you succeed in activating this ability you can not activate it again during the same combat.
You can attempt to use this feature a number of times equal to 1 plus your proficiency bonus. You regain all expended attempts when you finish a long rest.
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