Path of Bushido

Some barbarian are those who choose to be insightful warriors, hailing from cultures of structure and honor. These groups teach the Codes of Bushido, the 8 Laws by which you abide by for your life. To dishonor is to fail, and to fail is to be defeated. A barbarian who follows this path makes many strikes with blinding speed and sharpens their mind as the edge of their blade is.

Samurai's Yoroi

Starting at 3rd level, you gain proficiency in heavy armor, and can rage while wearing it.

Iaijutsu

Also at 3rd level, when you use your bonus action to activate your rage, you may immediately make an attack with a melee weapon as part of that bonus action. You may add your Strength modifier twice, instead of once, to this attack's damage roll.

Battle Trance

Beginning at 6th level, you can't be charmed or frightened while raging. If you are charmed or frightened when you enter your rage, the effect is suspended for the duration of the rage. 

Additionally, rage no longer ends your concentration on spells you have casted and you have advantage on Constitution saving throws to maintain concentration, however, you still cannot cast spells during your rage.

Live with Honor

At 10th level, once per long rest when you are hit by an attack that would reduce your hit points to zero, you may use your reaction to make a melee weapon attack with a weapon you are wielding. If your attack roll is higher than the triggering attack’s, the strike is blocked, reducing its damage to zero, and you gain temporary hit points equal to your Wisdom score.

Improved Iaijutsu

Starting at 14th level, your Iaijutsu feature is able to be used continuously while raging, allowing you to make an attack with a melee weapon as a bonus action on each turn until your rage ends. If you reduce an enemy's hit points to zero with an Iaijutsu strike, you may make an additional attack as part of the same bonus action, targeting another creature within your reach. If there are no creatures you wish to target within your reach, you may move as normal, provided that you have movement to spend. If you defeat the next creature, you can repeat this process until you do not defeat a creature you've attacked.