Path of the Hellion

Unlike most barbarians, your rage comes from deep within, beneath your soul, beneath your skin. Your rage comes from deep within your demonic blood, granting you frevor that burns as hot as the depths of hell. Your demonic arm that allows you to utterly brutalize your opponents, pulling them towards you and swinging them around like rag dolls. Making even the toughest of foes seem weak to your latent brute strength. 

Devil Bringer

This ability allows you to use a demonic spectral hand that allows you to pull and push enemies as long as they are your size your smaller, you can also grab objects.(If you are medium you can only grab/push medium and small creatures) When this happens they must make a contested athletics check, and if they failed they are pulled to you. Against creatures that are larger than you, you can make an attack roll with the arm to pull you towards them using your strength + proficiency modifier.  This has a range of 15 ft.  20ft at level 5, 25 at level 7, 30 at level 9.  you can pull or push objects and creatures one size larger than you with disadvantage. 

Devil Trigger

While raging you take on a more demonic form and gain resistance to fire as well as bludgeoning piercing and slashing, and are able to make attacks as your bonus action with your devil bringer. They scale as followed 3rd lvl 1d4, 5th level 1d6, 11th, 1d8, 17th, 1d10.  You must take the attack action on your turn with a melee weapon in order to do this. and yes, you can wield a two handed weapon while doing this. 

Devil Buster

Beginning at 6th level, you can make grapples with your infernal arm as a bonus action. After devil bringer pull or while a target is grappled you can make gruesome slam attack (1d20+str/prof) using your action dealing 3d6 bludgeoning damage plus str . adding 1d6 per 3 levels. 4d6 at level 9, 5d6 at level 12, 6d6 at 15 7d6 at 18. You can use this feature twice per rage

Sparda's Fist

At 10th level you take your arm to the height of its potential, you can now ignore size restriction and it now has the strength of 26 (+8) You gain advantage on medium and smaller creatures +8 can be added to hit on to grapple checks, pulls, and attacks made with the arm. You can gain access to these features for 1 minute per long rest.

Infernal Rage

Starting at 14th level, you can ignore death. 

While you're raging, having 0 hit points doesn’t knock you unconscious. You still must make death saving throws, and you suffer the normal effects of taking damage while at 0 hit points. However, if you would die due to failing death saving throws, you don’t die until your rage ends, and you die then only if you still have 0 hit points.