The Soul Hunter

As a monk that specializes in the mastery of ki the experts have been known to transform their physical traits with the ki they use. There are many who study this for only the expertise in tracking or enlightenment to the true form of the soul. The true masters of this are those willing to do what is hard without regard to how if effects their body as long as they strengthen their soul. Many of this tradition could be those who resort to finishing a task when they have already done enough for their job. On the darker end are those that use the teachings to hunt the souls of the innocent once they can see them.

Force Bolt

By spending 1 Ki point you can make a ranged spell attack using wisdom as your spell casting modifier against a target within 60 feet. the damage is equal to your martial arts die plus your wisdom modifier. 

Soul mark

When you hit a creature with a flurry of blows or a force bolt attack you may spend 2 additional ki points to mark their soul for 1 hour. Until the effect ends you deal extra force damage equal to your martial arts die to the target whenever you hit it with an attack and have advantage on any wisdom (perception) or wisdom (survival) checks you make to find the creature.

Chakra Shield

As a bonus action you may spend 2 ki points to gain resistance to a damage type of your choosing for 1 minute.

Hunters Form

As an action you may spend 5 ki points to gain the following benefits for 1 minute. You gain 50 temporary hit points. If any of these remain when the effect ends, they are lost.  You have advantage on attack rolls.  When you hit a target with an attack, that target takes an extra 2d12 force damage.  You have a flying speed equal to your walking speed. when you use flurry of blows or force bolt it does not cost you any ki points. After the minute is over and the effects end, you suffer from 1 level of exhaustion.