Iron Fist

Due to years of training, you managed to make your body the ultimate weapon.

Plated Body

Starting at level 3, you gain proeficiency in light armor, and don't get any disvantage due to that.

Iron Fist

Starting at level 3, you can add your DEX and WIS modifier to your damage dices on unarmed attacks. Also, you can now add you WIS modifier to your initiative checks.

Degreed

Starting at level 6, your unarmed strikes now do 1+ dices of damage (a d6 become a d8, and so on).  Aditionally, you can now use the ability Flurry of Blows a number of times equal to your DEX modifier divided by 3 for bonus action, but they still will cost you 1 ki point each. In exchange you lose your proeficiency with simple weapons. 

Spiritual Breakdown

Starting at level 11, you now spend 1 less point of ki on any use (abilities that require 1 ki are now free).

Clear Mind

Starting at level 11, you now will have advantage on a hit against a creature who did not make an action this turn.

Zen Mode

Starting at level 17, you may control your Ki to enter in a espiritual mode. During 1 minutes, you can feel the vital energy of every creature within 100 ft. from you, unarmed strikes have damage increased by 2d8, your AC is increased by 5 and you have advantage in DEX Saving Throws. To activate this state you can use a bonus action or an action.

You can use this feature a number of times equal to your WIS modifier divided by 3 (rounded down). You regain all the uses after a long rest.