Path of The Firestorm

Barbarians who follow the Path of the Firestorm become reckless hunters who master the art of fire, allowing them to burn anything in their path, even the strongest of creatures can't stop a raging storm of flames rushing at them.

Blazing Brawl

Starting when you choose this path, at level 3 you are able to turn your burning passion for battle into a real inferno, meaning while you are under the effects of your rage ability you gain the following benefits:  The first creature you hit on each of your turns with a weapon attack takes extra damage equal to 2d6 (This damage scales to 2d8 at lvl11, and 2d10 and lvl17), Your weapon attack's damage type is fire, and fire damage dealt by your weapon attacks can't be resisted.

Turn the Heat up!

At level 6, you become much harder to harm using fire attacks as you have learned to lessen its effects, gaining fire resistance.

Spreading Inferno

Starting at level 10, you become an ever-spreading inferno, You can use your bonus action to cause any enemy within 10ft of you to take an additional 2d6 fire damage (Once per turn) when damaged by you or an ally, while this ability is active you can not move. This ability lasts for 10 minutes or until you use your ba again to end it. You can use this Twice per long rest.

Phoenix revival

Starting at level 14, Your connection to fire now saturates your body. You have immunity to fire damage as long as you are under the effects of rage.

In addition, when you are reduced to 0 hit points, you can cause your body to explode. Each creature within 30 feet of you takes fire damage equal to 3d10 + your barbarian level. You then revive with 1 hit point in your previous space, along with your gear, and you gain 1 level of exhaustion. Once you revive this way, you can’t do so again until you finish 1d4 long rests.