Monks that follow the Way of the Ninja are a class that fights in darkness. This lives in hidden villages in places almost inaccessible to normal people. They train in the dark ninja arts and when they reach a certain level they leave their community to hone their ninja arts called Jutsu. Jutsu are separated into three groups, genjutsu, taijutsu and ninjutsu.

Genjutsu: (meaning: Illusionary Techniques) is one of the main jutsu categories which uses Ki. Unlike ninjutsu, the effects of genjutsu are not real, being only sensory illusions experienced by those who fall victim to it. A genjutsu is created when a ninja controls the Ki flow of a target's cerebral nervous system, thereby affecting their five senses; this is frequently used to create false images.

Taijutsu: (meaning: Body Techniques) is a basic form of techniques and refers to any techniques involving the martial arts or the optimization of natural human abilities. Taijutsu is executed by directly accessing the user's physical and mental energies, relying on the stamina and dexterity or strength gained through training. It typically does not require Ki, though ki may be used to enhance its techniques.

Ninjutsu: (meaning: Ninja Techniques) implies performing a supernatural or beyond normal ability, such as causing insidious effects through ki during your Taijutsu attacks, creating shadowy weapons like the Shurikenjutsu or making Kage Bunshin no Jutsu.

 

 

Genjutsu

At 3rd level, you gain the ability to perform the Genjutsu spells. By the ki power controlled by a complex system of hand seals, the ninja is able to manifest the desired technique, without providing material components.

Spell save DC = 8 + your proficiency bonus + your Wisdom modifier

Genjutsu	Ki
Gen-Jutsu [Minor Illusion]	0 ki
Meisaigakure no Jutsu [Invisibility]	2 ki
Bunshi no jutsu [Mirror Image]	2 ki
Fuinjutsu: Mugon [Silence]	2 ki
Kokuangyon no Jutsu [Darkness]	2 ki

  

Taijutsu

When you choose this tradition at 3rd level, your martial arts and your ki are strongly influenced by your practices in the art of Genjutsu.

Ghost Step: Whenever you use Flurry of Blows, you gain the benefit of the Disengage action, and your walking speed increases by 10 feet until the end of the current turn.

Hiden Weapons: Your ninja training teaches you to use shuriken (dart) in a precise and insidious way. Now shurikens are ranged monk weapons for you.

  

Ninjutsu: Yin Release

At 6th level, you gain the ability to summoning shuriken (dart) or kunai (dagger) from the shadow and the help of a shadow clone.

Shadow Weapons: This shadow weapons count as ranged monk weapon, and like your unarmed strikes they count as magical for the purpose of overcoming resistance and immunity to nonmagical attacks and damage. The shadow weapons did not share the same physical properties as a weapon created from metal. It has non-conductive, non-magnetic and non-reflective property. If you drop the weapon or throw it, it dissipates at the end of the turn. Thereafter, the weapons automatically reappear in the ninja's hands at the beginning of the next turn.

Flurry of Black Stars: When you use your bonus attack or your flurry of blow, you can use the shadow weapons or your flurry of black stars instead of your unarmed attacks, and you can add your ability modifier to the damage attack

 

Shadow Clone: Through a complex system of hand seals, you can use a bonus action to create a Kage Bunshin no Jutsu in an unoccupied space in dim light or darkness that you can see within 60 feet of you. The Kage Bunshin no Jutsu is shadow clone of the ninja that lasts until it is destroyed, until you dismiss it as a bonus action, until you manifest another shadow, or until you're incapacitated. Your shadow clone has the same size as you, and it occupies its space. On your turn, you can mentally command the shadow clone to move up to your speed in any direction (no action required).

You can temporarily transfer your consciousness to your shadow clone. As an action, you can see through your shadow's eyes and hear through its ears. During this time, your true body are deafened and blinded. You can end it at any time (requires no action).

Shadow clone trait: 

• Elemental shadow
• AC: 14 + your proficiency bonus
• Hit point: 1
• Stat Score: your stats
• Skills: your skills
• Saving Throw: your saving throw bonus
• Senses: Darkvision 60 Feet
• Damage Immunities: Necrotic, Poison
• Condition Immunities: Exhaustion, Frightened, Grappled, Paralyzed, Petrified, Poisoned, Prone, Restrained
• Amorphous: The shadow can move through a space as narrow as 1 inch (2,5 cm) wide without squeezing.
• Shadow Stealth: While in dim light or darkness, the shadow can take the Hide action as a bonus action. Its stealth bonus is also improved to +6.
• Sunlight Weakness: While in sunlight, the shadow has disadvantage on attack rolls, ability checks, and saving throws.
• Carrying Capacity: 10 pounds (4.5 kg).

 

 

Shadow Control

At 11th level, you learn to split your mind. You have more control over your shadow clone, now even in battle it can become a lethal weapon. Thanks to your mental ability, you also manage to channel your Genjutsu arts into your shadow weapons to trap your enemies in an illusion.

• Shadow Swap: As a bonus action, you can teleport, magically swapping places with your Kage Bunshin no Jutsu at a cost of 15 feet of your movement, but only if the distance between the two of you is no more than your normal speed.
• Shadow Attack: When you take the Attack action on your turn, any attack you make with that action can originate from your space or the shadow's space, but only if the distance between the two of you is no more than your normal speed. You make this choice for each attack.
• Shadow Reaction: When a creature that you can see within 5 feet of your shadow moves at least 5 feet away from it, you can use your reaction to make an opportunity attack against that creature as if you were in the shadow's space, but only if the distance between the two of you is no more than your normal speed.
• Mind Trap: You can use your Shadow Weapons to perform your Stunning Strike as a Genjutsu. If the attack hits the target, it must succeed on a Wisdom saving throw or being trapped in your Genjutsu until the end of your next turn. 

 

Shadow Domain

At 17th level, your understanding of the shadow element is enhanced to the point that you feel one with the darkness, which grants you the following benefits:

• Shadow Accuracy: When you attack in dim light or darkness, you make the attack roll with advantage and if you hit with your shadow weapons you can add 2d4 necrotic damage.
• Incorporeal Movement: You can move through other creatures and objects as if they were difficult terrain. You take 1d10 force damage if you end your turn inside an object.
• Shadow Clone Possession: When you are transfer your consciousness to your Kage Bunshin no Jutsu, you can use it for combat far from your original body. In this form you can use the shadow weapons, the Genjutsu art and attack like the original body. Once you use this feature, you can't do so again until you finish a long rest.

Shadow clone trait: Only when you use the Shadow Clone possession

• Elemental shadow 
• AC: 14 + your proficiency bonus
• Hit point: 1/3 of your full health
• Stat Score: your stats
• Skills: your skills
• Saving Throw: your saving throw bonus
• Senses: You can see normally in darkness, both magical and nonmagical, to a distance of 120 feet.
• Damage Vulnerabilities: Radiant
• Damage Resistances: Acid, Cold, Fire, Lightning, Thunder; Bludgeoning, Piercing, and Slashing from Nonmagical Attacks
• Damage Immunities: Necrotic, Poison
• Condition Immunities: Exhaustion, Frightened, Grappled, Paralyzed, Petrified, Poisoned, Prone, Restrained
• Amorphous: The shadow can move through a space as narrow as 1 inch (2,5 cm) wide without squeezing.
• Shadow Stealth: While in dim light or darkness, the shadow can take the Hide action as a bonus action. Its stealth bonus is also improved to +6.
• Sunlight Weakness: While in sunlight, the shadow has disadvantage on attack rolls, ability checks, and saving throws.
• Carrying Capacity: your carrying capacity

 

 

 

Ki Focus Crystal

Wondrous Item, Uncommon/Rare/Very Rare

Embedded in a ring, bracelet, or similar item, this small gem seems to have minimal value to the casual observer, but has perfect Ki resonance.

It can be something purchase, earned through a trial or mission from the ninja village, something you find in the corpse of a monk that contains ki energy, or a natural stone that through a natural process has accumulated ki energy for hundreds of years.

While carried by a Way of the Ninja, that monk can use this crystal to focus a stronger attack, adding +1/+2/+3 (based on rarity) to attack and damage rolls with the shadow weapons, unarmed attacks or Genjutsu art.