Path of the Inferno's Fury

Grappling and aura based class extra fire damage 

Embrace the Inferno

At 3rd level you are resistant to fire damage. When you enter rage you emit an aura of heat and fire burning those around you. Each creature within 5 ft of you must make a constitution saving throw or take fire damage equal to half your Barbarian level + proficiency (half on a successful save).

Inferno's Grasp

Starting at 6th level You can use 1 of your attacks when you take the attack action to wrap an enemy you can see within 5 feet of you in flaming tendrils. The target must make a Strength or Dexterity saving throw. On a failed save the target takes 2d6 fire damage plus your strength bonus and be considered grappled (on successful save the target takes half damage), You can use this feature a number of times equal to your constitution modifier per short/long rest.

The Fire Rages

At 10th level your aura now extends out to 10 ft. Additionally while you are raging you can use your Strength modifier instead of Charisma when making an intimidation check, you have advantage on this check if the target is within your aura.

Apex Inferno

14th level while raging you are immune to fire damage. Additionally Inferno's Grasp can now be used as a bonus action and you can target any creature you can see within your aura.