Chakra Needle Strike

You gain proficiency in Senbon. Small needles used to strike at acupressure points, which can either be thrown or inserted during melee combat. Great masters can manipulate their chii through the needles affecting their targets in different ways. Between healing their friends or hurting their enemies.

Undead and contructs have resistance to these attacks. 

Twist of the Needle

At third level when you gain the following abilites.

Needle healing
Out of combat you can spend 1 minute placing needles into acupressure points on a friendly target. That target regains health equal to one of their hit dice.

Needle Stab
Undead and contructs have resistance to these attacks. 
In combat you can spend 1 ki point when you make an unarmed melee strike. The damage becomes piercing and the target can suffer one of the following effects.

Roll (1d6)	Effect
1	Blood Poisoning. You do an addition 1d6 poison damage. the target must succeed on a DC 13 Constitution saving throw or be poisoned. At the start of each of your turns while you are poisoned in this way, you take 2d6 poison damage
2	Stun. The enemy becomes stunned for one round
3	Dizzy. The target becomes dizzy and falls prone. it has disadvantage on dex checks and saves for 1 round.
4	Blinded. The target becomes temporary blinded for a number of turns equal to a number of ki point used in the effect up to 3. (has no effect on creatures with blind-sight)
5	Bleeding. At the end of the next turn the enemy receives the same damage equal to the damage caused by this attack
6	Ki leech. You draw energy from the target. You regain 1d6 health and 1 ki point

Senbon needle mastery

At level 6 You can now throw your senbon needles. (You gain profinicey in darts)

You can now use your needle stab ability with your throwing needles. You must expend the ki point before you hit. (A miss means the ki is lost)

Precision Strike

Mastery of the needle has gained you the ability to strike with extreme accuracy.

When throwing your needles you don't gain disadvantage on long range attacks. Short range throws and melee attacks gain +2 to hit.

When you get a critical on a needle stab it costs you no ki.

You get a critical hit on a 19.

 

Final strike

at level 17 you can now enter an awakened state and also perform the finishing move. Final strike Once while in this state.

For the cost of 4 ki points. 

First you awaken your chi sense allowing you to see the flow of chi around you. You gain blindsight(120 ft) and truessight(30 ft) for 10 minutes and you can't be surprised.

Final strike

By placing a needle in a precise point in the enemy's body it causes a fatal blow. Undead and contructs have resistance to this attack.

The enemy rolls a dexterity saving throw. (You cant apply Legandary resistance to this save) On a successful save the target loses all its legendary actions this turn as it tries to recover from the impact. On a fail The Target suffers no damage until the end of its next turn The target has no legendary actions until its next turn. At the end of its turn the Target takes 10d12 Force damage.