Warrior of the Broken Knuckle

While many other monks will train with their ki to gain harmony with the world, the Broken Knuckle monks know the world to be fractured and harsh. They aim not to change the world or become at peace with it, but to survive it. The key tenant a Broken Knuckle monk will follow is that whatever doesn't kill you will make you stronger, and wish that it had when you come back for more. You live for the centre of the fight, using your high mobility to get into the centre of things while ensuring that, unlike other monks, you can take a hit. Pain has been your teacher, and it will soon be your enemies.

An Uncivilised Life

When you choose this subclass you have learnt that honourable combat only ends in honourable defeat, but dishonourable combat leads to victory. 

Once per round, when you hit a creature with an unarmed strike, you may spend a focus point to gain temporary hit points equal to the total damage rolled with your martial arts die until the start of your next turn. Alternatively when you take the dodge action in any way, you can roll your martial arts die and gain temporary hit points equal to the roll plus your wisdom modifier until the start of your next turn.

Personal Space

Your experience in dirty fighting has led you to understand more about opportunistic. Whenever an attack misses you, you can use a reaction to make an unarmed strike against the attacker so long as they are within your reach.

Furthermore, once per turn, whenever you hit a large or smaller creature you can expend a focus point to push back the target 5 times your proficiency bonus in any horizontal direction. If the creature hits an object or other creature then it must make a dexterity saving throw or take damage equal to 1 roll of your marital arts die for each 5ft of movement that would be left, if it hit a hostile creature then both creatures must make this save or take that damage. This increases to huge or smaller at level 11, and increases again to any creature that can be moved at level 17.

An Unstoppable Force

You are growing to become a pillar of strength and resilience, proving that none can block your path. As an action you can spend 3 focus points to charge forwards passing through any creatures in your path. You can move up to half your movement in a straight line during this action, and any creature you pass through the space of must make a dexterity saving throw or take magical bludgeoning damage equal to 4 times your martial arts die plus your dexterity modifier and be knocked prone. If they succeed, then they take half as much and aren't knocked prone. You cannot end this action in another creatures space, and cannot start the action if you would be forced to do so. This counts as part of your movement.

An Immovable Object

You have now become a near invincible fortress in battle, pushing the limits of survivability. As an action you can spend 5 focus points to gain +1 to your unarmoured defence and saving throws for each hostile creature within 10 feet of you. This bonus lasts for a minute.