Path of Perdition

Some Barbarians gain their power from faith, some have power through their ancestors , others have power from a feral bestial side. Not you, you gained power through the understanding of primordial rage, found in the beings of the lower planes. Demons, Devils and Yugoloths all have a source of primordial rage and you have given yourself over to this to gain power unlike anything else.

Lash of The Dark One

At 3rd level, Your inner fiend lashes out in the form of a fiery strike towards everyone. You may substitute one of your attacks this turn with a 15-foot cone of damage. You make separate attacks for each person in the cone. The damage is 1d12 of fire damage and is considered an attack for the purposes of maintaining rage. This damage increases to 2d12 by level 10.

Mantle of Perdition

At 6th level, Your inner fiend now protects from the harshest of magics. While raging you gain advantage on all saving throws towards Spells and Magical Effects.

Fiendish Fury

 At 10th level, the flames of perdition that you house grow even stronger. Your Lash of the Dark One is now a bonus action and any fire damage you deal ignores resistance to fire damage. You also gain resistance to fire damage at all times.

Avatar of Damnation

At 14th level, you have reached the apex of destruction and now assume a form representing your inner fiend. When you enter a rage you can choose between two forms to enter- Balor of Pit Fiend.

 Balor- As a part of your rage, You emit a 15-foot fiery aura around you. You may target anyone within the aura for damage equal to your proficiency bonus. The damage is your Strength modifier Plus your Proficiency bonus in Fire Damage. You also have a 40-foot flying speed. This damage takes effect at the start of each affected creature’s turn.

 Pit Fiend- As a part of your rage, You emit a 15-foot aura of pure terror, causing any creature of your choice to make a Wisdom saving throw against your DC. Your DC equals 8+Strength Modifier + Proficiency Bonus. You also gain a 40-foot flying speed. At the start of each creature’s turn they may make the saving throw again until sucessful.

 These forms last as long as you are raging or until you choose to end them.