Your wisdom has shown you the beauty of death and its importance to nature, 

Reapers Gaze

at 3rd level your ki has become dark and closer to that of the grim reaper you can spend a ki point barrow the power of the grim reaper can cast chill touch 

keen sense

At 6th level, your fighting instinct has grown and you can see in darkness, sense the invisible, and no longer rely on your sight. loss of sight no longer gives disadvantage unless it also takes your hearing.

corrupters of life

Beginning at 6th level, you’ve undergone extensive training in the killing of the undead and learn the flow of their ki and how to use the unnatural flow of it against them, You learn infernally, and you gain 1 d6 to add to attacks against the undead. can do that amount equal to your Wisdom modifier 

dark blows

at 6th level, You become a force of death and can add the power of death to your attacks and can add 1d4 of necrotic damage to all unarmed and monk weapon attacks 

Mind of Mercury

Starting at 11th level, you’ve honed your awareness and reflexes through mental aptitude and pattern recognition. Once per turn, if you’ve already taken your reaction, you may spend 1 ki point to take an additional reaction.

cling to life

at 11th level, you become used to being knocked down and used to the touch of death and can be revived by it instead of killed. you jump from 0 hot points to 1 unless you were hit by a crit 

necrotic Debilitating Barrage

Upon reaching 17th level, you’ve gained the knowledge to temporarily lower a creature’s fortitude by striking a series of pressure points. Whenever you hit a creature with one of the attacks granted by your Flurry of Blows, you can spend 3 ki points to cause the creature to suffer a vulnerability to necrotic damage. A creature who is affected by this feature cannot be affected by it again for 24 hours.

final chill

at 17th level you become a master of death and can use chill touch after furry of blowing for 2 ki points