The Flames Of The Pain In My Soul Burn So Brightly It Leaks Out During Battle.

 

Burning Spirit

At 3th level, you gain the ability to  engulfed yourself  in ki infused Red fire that deal 3d6 Fire damage to yourself, this fire doesn't hurt you or your party member after activation  but Each creature in a 15-foot sphere must make a Dexterity saving throw. A creature takes 3d6 fire damage on a failed save, or half as much damage on a successful one.

You Also Gain Cold Resistance and Psychic Resistance Damage

Pain to Flames

At 6th level, you gain the ability to damage yourself. As an action, you can give you unarmed strike extra 3d6 fire damage for every 5 damage deal to yourself. You must finish a long rest before you can use this feature again.

Ki of a Painful Soul

At 11th level, you gain the ability to deal 2d10 Fire Damage  to yourself to give yourself +6 Str +6 Dex +2 AC for 10 rounds as a Bonus Action .(This Abilty doesn't Stack)

Holy Fire Fist

At 17th level, you gain the ability to set up lethal vibrations in someone’s body. When you hit with an unarmed strike, you can deal 1/2 you Max Hit Points to engulf the target in a Searing White fiery explosion dealing 5d10 Fire Damage and 5d10 Radiant Damage. When you use this action, the creature must make a Dexterity saving throw. on a failed save deal all damage, or half as much damage on a successful one.