Way of the Oni

Harness the dark and devouring techniques of the Oni. You surrender yourself to the lust for Ki, going so far as to take it from your foes. You are able to manifest Ki into vision by forming large Ki based fists to extend your strike range, to pin down your foes, and block their flow of Ki. Delving even deeper into the powers of the Oni you are able to take upon their form making enemies tremble in fear of you and being able to consume the very Ki that keeps them alive. Monks that follow this path have an insatiable lust for Ki.

Oni's Grasp

When you chose this tradition at 3rd level, you tap into the powers of the Oni and are able to manifest large Ki based arms to harness their strength as you make unarmed strikes. Upon using Flurry of Blows with an unarmed attack you can choose one of the following effects on the target:

You attack from a distance as though you have reach.

It must succeed on a Strength saving throw or be grappled.

It must make a Constitution saving throw. If it fails, their Ki is blocked and can't cast a spell until its next turn.

Presence of an Oni

At 6th level, you can spend 3 Ki points to manifest an Oni spirit that becomes a visible aura around you gaining temporary hit points equal to 2x your class level plus Wisdom modifier. Upon summoning the Oni, enemies that have sight of you must make a Wisdom saving throw or become frightened of you for 1 minute.

Your temporary hit points only last for 1 hour. This feature can be used again after a short or long rest.

Devour Ki

At 11th level, you gain the ability to eat and abosorb the Ki of a creature to replenish your own. You must declare this action before making an attack and must be an unarmed strike. The creature must make a Constitution saving throw. If it fails you replenish 2 Ki points, if it succeeds you get 1 Ki point. If you deal the killing blow with this technique you don't spend a use of this feature. You can only use this feature once per turn.

You cannont gain more Ki then your maximum Ki pool. This feature can be used as many times equal to your Wisdom modifier (at least 1) before you need a short or long rest.

Oni's Hunger

At 17th level, you are able to devour the very Ki that keeps creatures alive. When you hit a creature with an unarmed strike you can spend 5 Ki points to devour the Ki of the creature. When you use this action a giant Ki based Oni head manifists and eats the creature whole, the creature must make a Constitution saving throw. If it fails, it is reduced to 0 hit points and you gain temporary hit points equal to your class level + Wisdom modifier. If it succeeds, it takes 10d10 Necrotic damage.

The creature's body is not consumed. You can only use this feature once per turn and unable to use this ability on the same creature for 1 minute.