Touch of Death
At 3rd level, when you reduce a creature within 5 feet of you to 0 hit points, you gain temporary hit points equal to your Wisdom modifier + your monk level (minimum of 1 temporary hit point).
Hour of Reaping
At 6th level, when you take this action, each creature within 30 feet of you that can see you must succeed on a Wisdom saving throw or be frightened of you until the end of your next turn.
Mastery of Death
Beginning at 11th level, when you are reduced to 0 hit points, you can expend 1 ki point (no action required) to have 1 hit point instead.
Touch of the Long Death
At 17th level, as an action, you touch one creature within 5 feet of you, and expend 1 to 10 ki points. The target must make a Constitution saving throw. On a failed save, it takes 2d10 necrotic damage per ki point spent on a failed save, or half as much on a successful one.