Vorpal Ronin

Disgrace, dishonor, betrayal, none of it means anything if you are dead. This subclass is for rogue samurai who have experienced turmoil so vicious and unrelenting, they must turn to the only thing that has yet to fail them. The feel of the blade in their hands, the wind from their strikes, and the ecstasy of the fight. Hunted, disgraced, or betrayed they seek redemption one way or another.

Strength of Body, Armor of None

When you choose this archetype at 3rd level, you hone your body and mind to emphasize speed. Clumsiness and the sluggishness of armor would only be your downfall. You gain unarmored proficiency. 

Vorpal Slashes

Starting at 3rd level, you've developed a battle flow that rips you through opponents. After making a successful attack on a creature, you can expend a sneak attack dice to move up to 30 ft. to perform another attack to a separate creature. You cannot attack the same creature twice, and upon a failed attack roll, the attacked creature gets an opportunity attack against you. Additionally, if you choose to end on a creature and have remaining sneak attack dice, you can apply those remaining sneak attack dice to that successful attack.

You don't have to qualify for sneak attack damage to perform any of these attacks, and any opportunity attacks during movement apply as normal, except for creatures who you have attacked with this ability this turn.

Sense of Self

At 9th level, your inherent senses and perception of self have grown incredibly. You gain blindsight up to 20ft.

Imperative Blow

Starting at 13th level, your senses sharpen further as the thrill of battle engulfs you, allowing weak points to become evident. You now critically strike on an attack roll of 19 or 20.

Fatal Flow

Beginning at 17th level, your mastery of the blade and inherent battle flow has made you a moving vorpal storm. You can now choose to apply each expended dice to each attack made with Vorpal Slashes. (i.e. 1d6 to first additional creature hit, 2d6 to second additional creature, 3d6 to next creature, etc.) This ability can only be applied once every short rest.