Path of the Infernal

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Flaming Wrath

At 3rd level, the flames from your rage cover your weapon. When you make a melee weapon attack while in rage, you deal an additional 1d6 + your proficiency modifier. 

Coat of Flame

Starting when you choose this path at 3rd level, your rage manifests as flames that surround your body. While you're raging you gain fire resistance. In addition, your AC increases by 2 while in rage.

Flame of the Phoenix

Starting at 6th level, you learn to harness the flame from your rage like a phoenix. As a bonus action you can gain temporary hit points equal to 1d12 + your constitution modifier. These hit points only last while in rage. 

You can use this feature a number of times equal to your proficiency bonus, and you regain all expended uses of it when you finish a long rest.

Flame Spirit

At 10th level, you've learned how to summon flame spirits using your rage. While in rage, you can use an action when to summon a small flame spirit in a unoccupied space within 5 feet of you. You can't use this feature again until completing a long rest. 

In combat, the spirit shares your initiative count, but it takes its turn immediately after yours. It can move and use its reaction on its own, but the only action it takes on its turn is the Dodge action, unless you take a bonus action on your turn to command it to take another action. That action can be one in its stat block or some other action. If you are incapacitated, the spirit can take any action of its choice, not just Dodge.

The spirit lasts for 8 hours or until you die. 

Infernal

Starting at 14th level, you gain the ability to become Infernal as an action. While Infernal, your strength and constitution are both increased by 2 to a max of 26, your size becomes large, your melee weapon attacks deal an additional 3d6 fire damage, and you gain fire immunity for 1 minute. 

Once you become Infernal, you can’t do so again until next dawn or until gain a level of exhaustion.