3: Blessed Prowess
6: Master Athlete
11: Sacred Boon
17: Eternal Favor
Starting at 3rd level, when you make a Strength, Dexterity, or Constitution check, you can add your martial arts die. When you fail an Anchor, Reflex or Fortitude saving throw you can use your reaction to spend 2 exertion and reroll.
Starting at 6th level, you move through the world with a fluid grace few can match. Your jump distances double, you gain advantage on checks made to jump, a climb speed equal to your Speed, and a swim speed equal to your Speed. In addition, once per long rest when you would gain a level of fatigue, you can choose not to gain that level of fatigue.
Starting at 11th level, when you perform specific acts of physical and martial prowess, you attract the attention of powerful otherworldly beings— entities that you can call upon for power. Choose three of the following benefits:
Boon of Gehenna. The favor of the Devils falls upon you whenever you take a life. When you reduce a living creature to 0 hit points, you can use your reaction to spend 2 exertion and gain a number of temporary hit points equal to your martial arts die plus your proficiency bonus. In addition, you have advantage on death saving throws for 1 minute.
Boon of Pasithea. When you succeed on a Wilderness check to Hunt and Gather, you find yourself under the favor of the Agathions and gather twice as much Supply.
Boon of Caelum. When you succeed on a Persuasion check against a creature indifferent to you, the Archons show you favor. You can spend 3 exertion to make an indifferent creature friendly towards you for 1 hour.
Boon of Forum. When you move more than your Speed during your turn, you find yourself under the favor of the Azata and can use your reaction to spend 2 exertion and take the Dodge action.
Boon of Atrium. When you make an opportunity attack against a creature, the waiting souls show you favor. You can spend 1 exertion to gain advantage on the opportunity attack.
Boon of Proelium. When you score a critical hit against a creature, you find yourself under the favor of the Einherjar and can use your reaction to spend 2 exertion and acquire this boon. Your next successful melee weapon attack deals additional damage equal to your martial arts die plus your proficiency bonus.
At 17th level, the gods that watch over you grant you a token of their appreciation. This commonly takes the place of a gold medal, but it can be any other trinket of similar size. While you are wearing the item, you are immune to the blinded, deafened, rattled and poisoned conditions. In addition, you can spend 1 exertion to use your Blessed Prowess feature on any ability check and you don’t need to spend exertion to call upon Sacred Boons. Finally, when you roll initiative and are wearing your Eternal Favor, you roll your martial arts die and regain that much exertion.
If your Eternal Favor is destroyed, the gods bestow another token upon you after you complete an arduous task to prove you are still worthy.