Way of the Open Hand (5A)

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Wholeness of Body At 6th level, you gain the ability to heal yourself. As a bonus action, you can regain hit points equal to three times your monk level. You must finish a long or short rest before you can use this feature again.

Tranquility Beginning at 11th level, you can enter a special meditation that surrounds you with an aura of peace. As an action, you gain the effect of a Sanctuary spell that lasts until the start of your next long rest (the spell can end early as normal).

Quivering Palm At 17th level, you gain the ability to set up lethal vibrations in someone's body. When you hit a creature with an unarmed strike, you can spend 3 ki points to start these imperceptible vibrations, which last for a number of days equal to your monk level. The vibrations are harmless unless you use your action to end them. To do so, you and the target must be on the same plane of existence. When you use this action, the creature must make a Constitution saving throw. If it fails, it is reduced to 0 hit points. If it succeeds, it takes 10d10 necrotic damage.

You can have only one creature under the effect of this feature at a time. You can choose to end the vibrations harmlessly without using an action.