Infernal Barbarian

The griffon's Saddlebag Infernal Barbarian 

Hellfireclaw

Starting when you choose this path at 3rd lvl, one of your hands transform into a large fiery claw whenever you enter your rage. The claw remains for the duration of your rage. if youre wielding a weapon with the clawed hand, its flames harmlessly spread to the weapon and wreath it in magical flames/ The first target you hit with this weapon on each of your turns takes an extra 1d6 fire damage. 

If you dont deal this fire damage with a weapon this turn, you can use a bonus action to make an unarmed strike with the claw, provided its empty. On a hit, the target takes the normal damage for you strike, which can either be bludgeoning or slashing damage(your choice)  , plus an extra 1d6 fire damage. 
   
The claws fire damage increases when you reach certain lvls in this class, increasing to 1d8 at 6th lvl, 1d10 at 10th lvl and 1d12 at 14th lvl.

Hellborn

You learn to speak, read, and write either Abyssal or Infernal( your choice). In addition, you can add your strength modifier to any Charisma ( intimidation) or charisma (persuasion) check you make when interacting with fiends. 

When you reach 10th lvl in this class, you can add your  strength modifier to any charisma (intimidation) check you make when interacting with any creature, instead of only fiends. 

Infernal Warrior

The infernal fire within you burn hot even while you're not raging. you gain resistance to fire damage. 

In addition, When you use the attack action to grapple a creature while you're raging, the target takes your hell fires claw fire damage if your grapple check succeeds, and again at the end of each of that creatures turns while it remains grappled. 

Planar Conspirator

you can make minor deals with an interested archfiend or similar power to peer into the minds of other creatures and exploit their fears. You can use an action to spend 2 hit dice, without regaining any hit points to cast detect thoughts. The DC for the spell is 8+your proficiency bonus+ your con modifier. 

Incinerating Wrath

When you take damage from a creature that you can see within 60 ft of you while youre raging, you can use your reaction to release a punishing flame from your claw toward them, duplication the effect of hellish rebuke spell (3rd lvl version, DC 8+proficiency bonus+ con modifier) You can use this ability twice per rage.