Path of the Gambit

In the depths of battle, some barbarians have learned to use their reckless abandon in battle to their advantage. Under the guise of predictable blind rage, warriors like these have gained tricks to eke out advantage over their targets.

Double Dealing

Beginning at 3rd level, you learn how to better use your own openings to your advantage. If a creature attacked you with advantage after the end of your last turn, you can use a bonus action to deal an additional 1d6 damage per attack against that target this turn. Whenever you are critically struck by a melee attack, until the end of your next turn, your next successful attack against that creature deals additional damage equal to your weapon's dice damage. 

At level 14, this damage increases to 2d6.

Feint

Beginning at 6th level, when you rage, you can feint with your attacks. When you use your Reckless Attack feature, the last creature you attacked does not gain advantage against you.

Overrun

Starting at 10th level, when you rage, you have advantage against creatures that haven't taken a turn in combat yet, and gain the benefit of your Double Dealing against them. Additionally, the first time you use your Reckless Attack feature against a creature to attempt two or more attacks, you reveal their armor class.

An Eye For an Eye

Beginning at 14th level, you can ignore pain to take advantage of your enemy's weaknesses. When a creature hits you with a melee attack, you can use your reaction to make an attack against that creature. You can use this feature a number of times equal to your Constitution modifier.