Path of the Abyss
While some barbarians look to their tribal spirits, the elements, or the gods, others realize that there is no more genuine embodiment of rage than champions of the Abyss.
Weapons of the Balor
Starting when you choose this path at 3rd level, you summon a whip of fire into an empty hand when you rage. While you hold the whip, you can use it to make a melee weapon attack against a creature within 15 feet of you as a bonus action on each of your turns after this one. On a hit, the target takes fire damage equal to 1d6 + half your barbarian level. You can force a creature you hit with the whip to succeed on a Strength saving throw (DC equal to 8 + your proficiency bonus + your Strength modifier) or be pulled up to 10 feet closer to you.
Damage rolls for the whip do not include your rage damage bonus, and critical hits with the whip do not benefit from Brutal Critical or similar features. If your rage ends or you let go of the whip, it dissipates. Thereafter, while raging, you can use a bonus action to cause the whip to reappear in your hand.
In addition, the bonus to damage rolls granted by your Rage feature becomes lightning.
Abyssal Resistance
Starting at 6th level, you acquire some of the natural fortitude required to survive the Abyss. When you finish a long rest, you gain resistance to 1 damage type of your choice from among Cold, Fire, Lightning, or Poison. The resistance lasts until you finish a long rest.
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Demonic Scout
At 10th level, you have gained enough strength that you can force a minor demon to serve you temporarily. You can summon a quasit by spending 1 minute focusing on your connection to the abyss. If you know a quasit's true name you can summon it specifically. The quasit obeys your commands and can't lie to you, though it is not required to be polite. The quasit will not attack, use the Help action, or use its Scare action.
After 10 minutes the quasit returns to the Abyss. Once you use this feature, you can't use it again until you finish a long rest.
Knowledge of Chaos
At 10th level, your connection to the abyss has granted you insights into that chaotic realm. You learn the Abyssal language. In addition, you have advantage on Intelligence checks to recall information related to the Abyss or demons.
Punishing Lash
Starting at 14th level, you can use your fire whip to punish those that would dare attack you or your allies. When a creature you can see within 15 feet of you makes an attack or casts a spell, you can use your reaction to attack that creature with your fire whip, provided you are holding your whip and the creature is still within 15 feet of you. When used in this way, you can't pull a creature with the whip.