You've been trained to harness your inner fire power that your ki can achieve. Your control over fire is that to be ether respected or feared.

Fiery Soul

At 3rd level when you chose this Monastic Tradition, you gain fire resistance (at later levels you become immune to fire damage), and the ability to cast fire bolt or burning hands as a bonus action with a ki point.

Burning Fists

Starting at 6th level you gain the ability to empower your fist with fire for 2 ki point. When you do this you gain an extra 1d6 points of fire damage with your melee attacks. This power increase by 1d6 at levels 10, 14, and 18. You can also give this ability to another person and empower their melee attacks with the same power. This ability must be activated at the beginning of your turn and all of your attacks have this power.

Infernal Will

At 11th level you gain the ability to push your fiery will outward to cast Wall of fire for 4 ki points. Your body is constantly warm you are resistant to cold. Your body has become attuned to your inner fire you are immune to fire.

Fierce Fire

At level 14, you gain the ability to shot out a ray of fire at the cost of 2 ki points. As a reaction when you are targeted by a melee attack you can spend 1 ki point impose disadvantage on the attack. And you can push out your inner fire as a bonus action to make a ring of fire in a 15 ft. radius from you at the cost of 2 ki points.