Lethal Puncher

Prerequisites: Dexterity and Constitution 13 or higher
You become one with darkened energy, with all of your years of training having led you to become a stronger guardian. You gain the following features:

• The damage die of your unarmed strikes increases by one step (1 to 1d4 to 1d6 to 1d8 to 1d10).

• You gain 1 ki point, which can be used to fuel your ki features. You regain all expended ki points when you finish a short or long rest.

• When you hit a creature with an unarmed strike, you gain 1 lethal point (5 maximum). When you take the Attack action on your turn, you may expend 5 lethal points or 1 ki point to cause your unarmed strikes to score a critical hit on a roll of 17 to 20 until the end of your turn. You may use this feature twice and you regain all expended uses when you finish a short or long rest.