Monks that follow the Way of the Burning Palm Tradition have discovered a new way to manipulate their ki by heating it up. This allows them to manipulate the temperature of both the environment around them and their own body. Walking on hot coals is a common method of trainig for monks that study this tradition. 

Heated Ki

Starting at 3rd level, after hitting a target with an unarmed strike or Flurry of Blows attack you can spend 1 ki point to attempt to ignite the target. The target must make DEX saving throw against your ki save DC. on a failed save the target catches fire and takes 1d10 damage at the start of each of their turns, until it or another creature spends an action to try and douse the flames. 

Aura of fire

Starting at 3rd Level you learn to channel you heated ki throughout you body in specific ways, allowing you to you gain a resistance to fire damage.  

Explosive Palm

Starting at 6th level, after hitting a target that is on fire, with an unarmed strike or Flurry of Blows attack you can spend 1 ki point to cause an exsplosion at the point of contact and deal extra Fire damage equal to your Martial Arts die, you can use this feature only once on each of your turns.  

Searing Counter

Starting at 6th level, when a Creature misses you with a melee attack you can spend 1 ki point to attempt to ignite the target. The target must make DEX saving throw against your ki save DC. on a failed save the target catches fire and takes 1d10 damage at the start of each of their turns, until it or another creature spends an action to try and douse the flames. 

Ashen Dexterity

Starting at 11th level you can spend 2 ki points to give yourself advantage on the next unarmed strike or Flurry of blows attack you make against a target that is on fire.  

Blaze Deflection

Starting at 17th level, Once per long rest, when a creature hits you with an attack or spell that deals Fire damage you can regain ki points equal to 1 + your wisdom modifier.