Path of the Raging Flame

As a barbarian, you have devoted your life to the rage that boils within your heart and soul. This is true for you, as well as all of the others. Those of the Raging Flame, however, have allowed themselves to be consumed by this rage, giving freely their life so as to burn the world in their fury.

Fiery Vengeance

Starting when you choose this path at 3rd level, you allow the spark of hatred in your heart to blossom into an inferno with your rage. While raging, you gain one fiery vengeance die whenever you are hit or take damage, up to five. You can add these die to damage, giving your attacks extra fire damage, or attack rolls while you are raging. You can add any number of fiery vengeance die to damage rolls, but only one to attack rolls. At 3rd level, the fiery vengeance die is a d4. At 6th level, it becomes a d6. At 10th level it is a d8, and 14th level a d10. Fiery vengeance die reset to zero upon a short rest. 

Relished Burning

Starting at 6th level, you recover hit points equal to half the amount rolled by spent fiery vengeance die.

Self-Immolation

Starting at 10th level, you can bolster the fire within with a flash of sequestered anger using your action. Roll a d4, and gain that amount of fiery vengeance die. You and all targets within a 20-foot-radius then take fire damage equal to a roll of the current amount of fiery vengeance die you have, without consuming any of them. The damage taken from the explosion does not grant fiery vengeance die. You can do this once per short rest, or when you roll a natural 20 with an attack die, or are hit by a natural 20.

Heart of Flame

Starting at 14th level, you are resistant to flames and cold while you are raging. If you are already resistant to either cold or fire, the damage is quartered and rounded up, with a minimum of 1. When you begin raging, you gain a fiery vengeance die.