Way of the Long Death Monk

Feature Description
Touch of Death At 3rd level, your study of death allows you to extract vitality from dying creatures. 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, you can unsettle or terrify those around you. As an action, each creature within 30 feet that can see you must make a Wisdom saving throw or be frightened of you until the end of your next turn.
Mastery of Death At 11th level, you can escape death itself. When you are reduced to 0 hit points, you can expend 1 ki point (no action required) to remain at 1 hit point instead.
Touch of the Long Death At 17th level, you can channel the energy of death into a creature. As an action, you touch one creature within 5 feet and expend 1 to 10 ki points. The target makes a Constitution saving throw, taking 2d10 necrotic damage per ki point spent on a failure, or half as much on a success.