Way of the Spirit of Flame

You have gained the attention of a spirit of fire, which granted you the ability to add its elemental powers to your arsenal.

(A DnD rendition of Agunimon from Digimon Frontiers)

Protection of AncientGreymon

You gain power over flames due to the protection of an ancient creature that the spirit that is watching over you was a descendant of.

You gain access to Holy Fire Ki abilities, which works in tandem with your Ki points as well as their own (max of 10 Holy Fire Ki you can gain).

You also gain resistance to Fire and Cold damage.

Inherent Skills of the Spirit of Flame

You learn certain skills from the Spirit of Flame, granting you additional fire power. You gain unique attack skills that require your newly obtained Holy Fire Ki points, starting with two at level 3 followed by one at levels 6, level 11, and level 17.

Fire Dash

By using 3 Holy Fire Ki Points as a bonus action, you can increase your walking speed by a multiple of four. As you dash, you leave a trail of fire in your wake. By using this Bonus Action, you cannot use the action Dash.

Available at level 3

Pyro Punch

By using one Holy Fire Ki point, you add 2d4 + your Dexterity Modifier Fire damage to your unarmed strikes that are dealt by your fists on hits.

Available at level 3

Pyro Tornado (Kick)

By using 2 Holy Fire Ki Points, you unleash a a whirlwind of kicks made of fire 10 feet surrounding you. Creatures caught in the the whirlwind must make a Dexterity Saving Throw of 8 + your Dexterity modifier + your Proficiency Bonus. On a failed save, they take 3d6 Fire damage. On a success, they take half damage.
(This takes an action)

Available at level 3

Pyro Tornado (Punch)

By using 2 Holy Fire Ki Points, you unleash a cone of fire of up to 30 feet. Creatures caught in the cone must make a Dexterity Saving Throw of 8 + your Dexterity modifier + your Proficiency Bonus. On a failed save, they take 3d6 Fire damage. On a success, they take half damage.
(This takes an action)

Available at level 3

Solar Wind Destroyer

By expending five Holy Fire Ki points as an action, you unleash a heatwave around you. Creatures within 30 feet around you must make a Dexterity Saving Throw of DC 8 + Your Dexterity Modifier + your Proficiency Bonus. On a failed save, they take 15d6 Fire damage and are knocked prone. On a success, they take half damage and are not knocked prone.
This skill can only be used once per long rest.

Available at level 17

Wildfire Tsunami

You have tapped into the Beast side of the Spirit of Fire, granting you the ability to strike at enemies with a wave of fire. By expending 4 Holy Fire Ki Points, you send a wave of fire at a height of 20 feet forward in a radius of 10 feet surrounding you. Creatures in that radius must make a Dexterity Saving Throw of DC 8 + your Dexterity Modifier + your Proficiency Bonus. On a failed save, they take 10d4 Fire damage and take 2d4 burn damage during each of their turns. On a successful save, they take half damage and are not burned.
Those who failed must make a Medicine check of DC 17 to stop the burn damage (this will take their action).

This ability can only be used once per long rest.

Available at level 11

Incarnation of the Firewall

You have become more attuned to the Spirit of Fire, granting you abilities to control flames more easily. By expending two Holy Fire Ki points, you can control the fires around you within 30 feet. You can choose to expand their power, dim them, or smother them out completely. You also gain access to the spell Fireball. You can only use this spell up to 3 times per long rest.

Gatling Burst Strikes

You have learned a multi-strike attack from the Spirit of Flame. By expending two Holy Fire Ki as an action, you can do up to 8 unarmed strikes.

Blazing Fire of Courage Counter

You have completely mastered the powers of the Spirit of Flame. Whenever you are attacked by an opposing Creature, you can expend one Holy Fire Ki point to counterattack with an Unarmed Strike. 
(While this is a reaction, you can use it multiple times)