Way of the Unseen Blade. [Remastered]

The Way of the Unseen Blade was passed down among "cowards"; the essence of its style lies in "surprise attacks". Because of this, it is unsuited for those aware of its techniques. The style is not meant for sport or fair fights, but rather for survival in incredibly dangerous situations and times. Created by peasants and farmers, passing down generation to generation as the peasantry hone their secret craft.

Phantasmal Weapon

By level 3, your training of both armed and unarmed combat transcends physicality, allowing you to emulate weapon combat while empty-handed.

Choose one martial melee weapon that lacks the heavy or special property to be your unseen blade.
You gain proficiency with the chosen weapon if you don't already have it, and it is considered a monk weapon for you.
While unarmed, you gain the magical bonuses and effects of your chosen weapon, you can also sheathe it and unsheathe it as a free action, whenever.
Unarmed attacks you make deal the same damage die and damage type as the chosen weapon unless you choose to use your martial art die instead, in which case the attack deals damage equal to your basic unarmed strike.

Smuggling Mastery.

You've been taught to keep your weapons and items on you hidden well.

You may now add your Wisdom Modifier to all Dexterity checks.

Swift Strike

Starting at level 6, your deceptively fast attacks aided by your mind-numbing ki allow you to strike in a way the target will never see coming.

At the start of your turn you may choose to attack unnoticed.
Roll a Dexterity check (Stealth OR Sleight of Hand) contested by everyone's Wisdom (Perception) checks. [You win on a tie.]
All the creatures that don't surpass your check fail to perceive your attacks until the start of your next turn, as you attack swiftly and quickly, but your weapons seem to remain sheathed, and your hands are by your sides.
When you make an unarmed strike or an attack with a monk weapon in this way, you may spend 1 ki point to double your dexterity modifier for damage to all attacks on that turn.

This can be combined with Stunning Strike and Delayed Death.

Delayed Death

At 11th level, the precision of your strikes becomes wholly unparalleled, allowing you to strike in such a way that your target doesn't realize they've been cut until long after the fact.

You can spend 1 ki point at the beginning of your turn to accumulate the damage of your melee attacks as you hit your target, and unleash it upon them at any point determined by your (Monk level * 4) minutes.
Every turn that passes after the first time you use this ability allows you to roll 2 additional martial arts die per round until you unleash the damage onto the enemy. 

Upon using this ability, your targets do not realize they are being attacked, nor can they feel your attacks until the damage is accumulated and finally released, potentially killing them.

 

Perfectionist of the Unseen Arts.

You gain proficiency in Stealth & Sleight of Hand checks unless you're already proficient. In which case you gain expertise.

Master of the Unseen Blade.

At 17th level, you can use your action to spend 3 ki points to ready an Unseen Strike that cannot be perceived regardless of the perception check of all surrounding onlookers.
You can then attack one target with your Phantasmal Weapon or Unarmed Strike on the next turn with advantage.
On a hit, the target must make a Dexterity saving throw equal to (8+Dex+Prof) or drop to 0HP as you slice the very atoms of their being apart, otherwise, they take 10d10 magical slashing damage as you cut through them like butter.

This can be used with Delayed Death, dropping the target at any point after the strike up to an hour later.

Innocuous Figure.

You can now hide as a bonus action.
Only few have ever seen your strikes. if any. You are never considered the most dangerous person in any room.

You now have advantage on all Dexterity (Sleight of Hand) Checks.
You have honed your kinesthetic senses beyond what many thought possible, embodying your weapons as your own limbs.