Monks of the Way of the Grim Reaper are obsessed with the meaning and mechanics of dying. They capture creatures and prepare elaborate experiments to capture, record, and understand the moments of their demise. They use the undead in culling those marked for death.They then use this knowledge to guide their understanding of martial arts, yielding a deadly fighting style against the living.

Reaper's Rondo of Mystic Arts
This ability starts at 3rd level with the 1st Rondo, the 2nd Rondo is available at 9th Level and the 3rd Rondo being available at the 15th level. Each rondo granting access to selection of spells, except for the cantrips, each rondo has a ki cost attached to the spells available in it. 

Reaper's Fated Grasp
Starting when you choose this tradition at 3rd level, you tap into the threads of fate that are bound to a person. You can control these threads in a limited fashion like that of the spell Telekinesis. Once per long rest you can use Telekinesis to pull a creature 30ft close to you should they fail their Strength check vs your ability check and are within 60ft of you.

Reaper of Nightmares
At 6th level, you gain the ability to unsettle or terrify those around you as an action, for your soul has been touched by the shadow of death. When you take this action, each hostile creature within 30 feet of you that can see you must succeed on a Wisdom saving throw or you become an illusory manifestation of its deepest fears, visible only to that creature and they take 4d10 psychic damage. Should they succeed at the saving throw they take no damage that round. This affect persists for a rounds of rounds equal to half your Monk Level plus Wisdom modifier. This ability is usable once per short rest. 

Earth Bound Rapture
Beginning at 11th level, you use your familiarity with death to escape its grasp. When you are reduced to 0 hit points, you can expend 6 ki point (no action required) to be fully restored on the following round as per Resurrection. This Class Feature can only be used once per long rest.

Soul Bound Revival
Starting at 17th level, The Grim Reaper Monk can pass through a crowd and leave no lasting memory, As though they were under a constant Greater Invisibility, Mind Blank, Pass Without Trace. The Greater Invisibility function of this class feature can be suppressed or reactivated as bonus action.

Reaper's Rondo of Mystic Arts

 Starting 3rd level:
1st Rondo - The Enthralling Opening and Verse (Aside from cantrips(free of costs) the ki cost is 2 each.)

“Our sweetest songs are those of saddest thought.” Percy Bysshe Shelley, The Complete Poems

 

Cantrip: Sacred Flame, Fire Bolt, Mage Hand, Eldritch Blast
Level 1: Hex, Inflict Wounds, Guiding Bolt, Hunter's Mark,Searing Smite
Level 2: Gentle Repose. Branding Smite

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At The 9th Level: 2nd Rondo - Climatic and Dynamic Chorus with a sounding Refrain (the ki cost is 4 each.)

“Words make you think. Music makes you feel. A song makes you feel a thought.”― Yip Harburg

 

Level 3: Revivify, Vampiric Touch
Level 4: Shadow of Moil, Dimension Door
Level 5: Danse Macabre, Enervation, Holy Weapon, Far Step, Destructive Wave, Hallow

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At the 15th Level: 3rd Rondo- Breakdown and Coda (the ki cost is 6 each.)

"Silence is more musical than any song." Christina Rossetti

Level 6:  Soul Cage, Circle of Death
Level 7:  Finger of Death
Level 9:  Imprisonment (Minimus Containment only)

 

Reaper's Fated Grasp

Starting when you choose this tradition at 3rd level, you tap into the threads of fate that are bound to a person. You can control these threads in a limited fashion like that of the spell Telekinesis. Once per long rest you can use Telekinesis to pull a creature 30ft close to you should they fail their Strength check vs your ability check and are within 60ft of you.

Reaper of Nightmares

At 6th level, you gain the ability to unsettle or terrify those around you as an action, for your soul has been touched by the shadow of death. When you take this action, each hostile creature within 30 feet of you that can see you must succeed on a Wisdom saving throw or you become an illusory manifestation of its deepest fears, visible only to that creature and they take 4d10 psychic damage. Should they succeed at the saving throw they take no damage that round. This affect persists for a number of rounds equal to half your Monk Level plus Wisdom modifier. This ability is usable once per short rest.

Earth Bound Rapture

Beginning at 11th level, you use your familiarity with death to escape its grasp. When you are reduced to 0 hit points, you can expend 6 ki point (no action required) to be fully restored on the following round as per Resurrection. This Class Feature can only be used once per long rest.

Specter's Passing

Starting at 17th level, The Grim Reaper Monk can pass through a crowd and leave no lasting memory, As though they were under a constant Greater Invisibility, Mind Blank, Pass Without A Trace. The Greater Invisibility function of this class feature can be suppressed at will.