The Ronin of the East

Ronin of the East Starting at third level you gain proficiency with the katana. You also gain new skills known as flairs. These are dexterous works of skill ingrained in the bodies of the aramusha warriors. They can be used with your ki points, and they scale with your martial arts die. Flairs:

Swan Slash: As bonus action you may use a ki point and prepare a lightning fast attack. You instantly move up to 30 ft as you seemingly disappear and reappear at near impossible speed. Afterwards, you may make take the attack action, including any extra attacks against a creature within 5 ft of where you landed, add one roll of your martial arts die to the damage dealt for each strike you make with a monk weapon.

Monkey Toss: As a bonus action you may use a ki point to make a ranged weapon attack with a thrown simple weapon. If it hits, add one roll of your martial arts die to the damage total.

Cat Walk: As a bonus action you may use a ki point to take the hide action, if you do add a roll of your martial arts die to the total.

Impenetrable Defense Starting at sixth level you have honed your skills with the katana even further. When you are wielding a katana, you may use your reaction when you get hit with a melee weapon attack to reduce the incoming damage by 1d10 + your monk level.

Bloody Stream Starting at eleventh level, you learn a forbidden technique of the aramusha warriors, and only the most powerful of them may obtain the prowess necessary for such a skill. At the cost of 4 Ki Points and an action you make a massive bleeding slash as a river of crimson flows from your weapon. You may make a katana attack against each creature of your choice within 15 ft of you, if the attack hits, a creature takes extra damage equal to a roll of your martial arts die. 

Godslayer Slash Starting at seventeenth level, you gain the ability to destroy your foes with a single swipe of your blade. Whenever you land a critical hit with a katana attack on a creature, you may spend three ki points or more, for every ki point spent, roll an additional damage die for the total. If this damage does not reduce the target to 0 hit points, the target is blinded until the end of your next turn.

Bonus Proficiencies

When you choose this tradition at 3rd level, you gain proficiency with the Katana. This weapon is a Longsword with the Finesse property.

Flairs of the Aramusha

You gain new skills known as flairs. These are dexterous works of skill ingrained in the bodies of the Aramusha warriors. They can be used with your ki points, and they scale with your martial arts die.
Flairs:

Swan Slash: As bonus action you may use a ki point and prepare a lightning fast attack. You instantly move up to 30 ft as you seemingly disappear and reappear at near impossible speed. Afterwards, you may make take the attack action, including any extra attacks against a creature within 5 ft of where you landed, add one roll of your martial arts die to the damage dealt for each strike you make with a monk weapon.

Monkey Toss: As a bonus action you may use a ki point to make a ranged weapon attack with a thrown simple weapon. If it hits, add one roll of your martial arts die to the damage total.

Cat Walk: As a bonus action you may use a ki point to take the hide action, if you do add a roll of your martial arts die to the total.

Impenetrable Defense

Starting at sixth level you have honed your skills with the katana even further. When you are wielding a katana, you may use your reaction when you get hit with a melee weapon attack to reduce the incoming damage by 1d10 + your monk level.

Rivers of Blood

Starting at eleventh level, you learn a forbidden technique of the Aramusha warriors, and only the most powerful of them may obtain the prowess necessary for such a skill.
When you spend 4 Ki Points you may use your action to make a massive bleeding slash as a river of crimson flows from your weapon. You may make a katana attack against each creature of your choice within 15 ft of you, if the attack hits, a creature takes extra damage equal to a roll of your martial arts die.

Godslayer Slash

At 17th level, you gain the ability to destroy your foes with a single swipe of your blade. Whenever you land a critical hit with a katana attack on a creature, you may spend three ki points or more, for every ki point spent, roll an additional damage die for the total. If this damage does not reduce the target to 0 hit points, the target is blinded until the end of your next turn.