Path of the Hellfire

Your rage transcends your mind and body and taps into the dark energies of the Lower Planes. The Path of Hellfire is paved in brimstone and bones. Whether your power stems from the blessing of a powerful Fiend or from a cult’s rituals, when you enter into your rage you bring with you the fury of Devils and Demons.

Fiend Fire

Starting when you choose this path at 3rd level, your weapon ignites when you enter your rage. While your weapon is ablaze, it deals extra fire damage to any target it hits. The extra fire damage is equal to your Proficiency Modifier.

as well your fists become unarmed strikes dealing 1d6+Strength modifier, this scales with your level, 1d8 at level 5, 1d10 at level 11 and 1d12 at level 17, whenever you take attack action with your fists you can make another attack as part of the same action, this increases to making another attack at level 5 (in total 4 attacks)

Infernal Blood

Beginning at 6th level, the infernal and demonic energies of your rage has made changes to your body. You might grow a crown of small horns, your eyes might turn black, or you might constantly smell of sulfur. You gain Proficiency in Charisma (Intimidation) checks,you gain darkvision out to 60 feet and you gain resistance to fire damage. If you already have Proficiency, your proficiency bonus is doubled. If you already have darkvision from your race, its range increases by 30 feet and if you already have resistance to fire it changes to immunity

Hell's Touch

At 10th level, you are able to channel the power of dark energies directly to hurt your enemies. Your weapon attacks count as magical for the purpose of overcoming damage resistance and immunity to non-magical attacks and damage.

as well, any fire damage you cause ignores resistance and treats immunity as resistance 

 

Terrifying Visage

Starting at 10th level, you can assume a horrible visage meant to terrify foes. When you enter your rage any enemies withing 30ft of you must succeed on a Charisma saving throw (DC equals 8 + your proficiency bonus + your Constitution modifier), on a failed save they must subtract 1d6 on every ability check, attack roll, and saving throw for the next minute

 

Warrior of Hell

Starting at 14th level you've become a warrior of the 9 hells, and can use your fiendish bloodline with you to the battlefield, stopping anyone that stands in your way. when raging you constantly lash out with flame like tendrils, dealing 2d6 necrotic or fire damage (or choice when you rage) as well you gain immunity to the charmed and frightened condition

 

as well, when a creature within 5ft of you tries to attack you while raging, you can use your reaction to make an attack agains them and any other creatures in range, when you do this. this creature ,and any others attacked, must also succeed on a Charisma saving throw (DC the same as Frightening Visage) as you strike fear into its eyes. if the creature fails then it is paralyzed until the start of your next turn, you may do this a number of times equal to your proficiency bonus and regain it on a long rest (each creature you hit equals a singular usage)