Starting at 3rd Level, you gain the abilities Secret Sight and Secret Fist.

Secret Sight- Your eyes can now see the secret points of vulnerabilities that people and creatures have and you can strike with expert speed and precision. When you using Flurry of Blows, you can spend an additional ki point to gain advantage on all your attacks till your next turn.

Secret Fist- You gain the techniques used by the secret fist. You are able to change your damage type from Bludgeoning, to piercing, to slashing, and vice versa at any time with your unarmed attacks.

Starting at 6th level, you gain the abilities Points of Dread and Flurry of Siwang.

Points of Dread- This ability takes your piercing strikes and adds a special something to your Flurry of Blows. 

If you land one piercing strike, your opponent must make a constitution saving throw versus your DC. On a failure, your target becomes stunned until your next turn. On success, nothing happens.

If you land two piercing strikes, Your opponent must make a constitution  saving throw versus your DC. On a failure, your target becomes Frozen as if held by the hold person spell and it acts like the hold person spell but it requires no concentration and lasts 2 turns. On a success, nothing happens.

If you land three piercing strikes, Your opponent must make a constitution saving throw at disadvantage versus your DC. On a failure, your target takes an extra  2 martial arts die of damage and the target is incapacitated til the end of your second turn.

Flurry of Siwang- You can spend additional ki point when you use your Flurry of blows to cause double damage per every hit. 

Starting at 11th level, you gain the abilities Blades of Siwang and Shadow of Siwang.

Blades of Siwang- This ability takes your slashing strikes and adds a bonus to each hit when you use slashing type damage in succession using Flurry of Blows.

If you land one Slashing Strike, you do an additional 1d4 of damage.

If you land two Slashing Strikes, you do an additional 1d8 of damage per strike.

If you land three Slashing Strikes, you do an additional 1d10 of damage per strike.

Shadow of Siwang- This ability gives you advantage on Stealth checks. You gain Blindsight out to 30 feet if you do not have Darkvision. This also grants you a +2 ac when you are in dim light or darkness.

Starting at 17th level, you gain Secret Art: Death Fist.

Secret Art: Death Fist- You have unlocked the ultimate technique of the Secret Fist. You go through a series of piercing jabs that can result in death. If you can land 4 hits in a single turn using piercing strikes, you can use an additional 3 ki points to make additional Attack with no attack roll. Your opponent must make a Dexterity Saving throw versus your DC. On a failure, your opponent becomes unconscious and dies like its heart just gave out. On a Success, you opponent takes 7d10 piercing damage.