Way of the Dark Fist

There is a darkness inside everyone. There is power in that darkness. While others suppress it, hide it and shy away from it, others instead embrace it. The call of the power of darkness is too strong for them to deny. The call upon this power and use it to destroy their enemies. 

Void Strike Fist

At 3rd level, you gain the use of the power of the dark fist, the harbinger of destruction. When you use the Attack action on your turn to make an unarmed strike, you can spend 1 ki point to convert the force of your fist to the power of the dark fist. Hits with your unarmed attacks deal necrotic damage instead of bludgeoning damage this turn, and if you spend 1 ki point when an attack hits, it deals extra necrotic damage equal to your unarmed strike damage.

At 11th level, when you hit a target with an unarmed strike empowered by the Void Fist Strike feature, you can spend an additional 3 ki points to send it through dark dimensions. That target must make a Charisma saving throw or be sent hurtling through the lower planes until the end of your next turn. If the target is not a fiend, it takes psychic damage equal to the damage the initial necrotic damage.

Darkflare Ascension

At 6th level, you gain the ability to enter a higher state as a bonus action, focusing the darkest of energies into your attacks. While you are in your ascended state, for 1 minute, you add your Wisdom modifier to melee weapon attack rolls and damage with your unarmed attacks and monk weapons. This ends early if you dismiss it as a bonus action or become incapacitated.

You can use this feature twice between long rests.

The Shadow that Follows Behind

At 11th level, the dark fist has empowered you to follow your quarry, wherever that quarry may be. You can use your movement and spend 1 ki point to teleport to an unoccupied space you can see within 60 feet that is within 5 feet of a hostile creature. If that location is in the air, you hover there until the end of your turn, at which point you fall as normal.

Wrath of the Dark Fist

At 17th level, you can use all the darkness you have built up inside to destroy your target. You can use your action to make a series of melee weapon attacks against a target you can see within 5 feet of you. You can make any number of attacks with your unarmed strike or a monk weapon, one at a time, against that target, until you miss. For each subsequent attack, you take a cumulative -2 penalty for each attack you have taken after the first.

You regain the use of this feature after a long rest.