For some reason the Barbarian was unwillingly bestowed this power, exposed to some sort of magic heavy environment, or is the result of a failure ritual, and thus is now forced to live a life of chaos and unpredictability.

When a barbarian who follows this path rages, it is a bellowing roar for freedom, an explosion of expression, manifesting in unpredictable ways.

Lingering Magic

Starting at 3rd level, magic erupts from you as you rage. If you hit an attack using your Reckless Attack feature, it deals an extra force damage equal to 1d6 + half your barbarian level. 

When you reach 14th level in this class, you increase the die to a d10.

Arcane Bombardment

At 6th level, the heavy flow of the veil inside your body reacts to the world around you. When a creature that you can see forces you to make a Saving Throw while you are raging, you may deal force damage to that creature in a number of d6s equal to your Raging Damage bonus. For exemple, if your Raging Damage bonus is +3, you deal 3d6 force damage (if you roll a 1 or 2 on this damage dies, you can reroll those dies and must use the new roll, even if the new roll is a 1 or a 2).

You may use these feature a number of times equal to half your Barbarian level. You must write down the number of times you have used this feature.

Shattering of the Veil

Starting at 6th level,  the veil and magic around you start to become unstable and may cause some effects all around. You must write down the number of times you used your Arcane Bombardment feature. This number becomes the DC of Shattering of the Veil. 

Whenever you enter your rage, or your life is brought to 0 hit points, roll a percentile die. If you roll below the DC, reality breaks causing the Shattering of the Veil.

 Shattering of the Veil. A 20 ft sphere of colorful lights strike out from your body. This sphere is always centered on you. When this ability comes to light, for the next minute, any creature who enters the area, or start it's turn inside of it takes damage equal to two times your barbarian level. In addition to that whenever a creature casts a spell within this area, if the level of the spell is equal or less than your Constitution Modifier, the spell slot is not expended.
When this effect ends, all creatures within the area fall unconscious for 1d12 hours. A spell such as Greater Restoration cancels this effect.

While inside the sphere, it seams that the skies ar slowly shattering revealing the stars and the planes beyond, the ground moves and rumble as if spinning underneath your feet, and yet you do not feel dizzy nor unbalanced by this.

Once this ability goes off, the DC halves (rounded up). 

Magic Reserves

Beginning at 10th level, you can channel the magic surging inside you into other creatures. As an action, you can touch a creature and expend a barbarian Hit Die, the creature recovers an expended spell slot of a level equal or less than your Constitution Modifier (minimum of 1). If the creature you touch can’t recover a spell slot of that level, the creature instead gains temporary hit points equal your Constitution Ability + 5.

After that roll 1d12. You take force damage equal to the number rolled.

Chaotic Fury

At 14th level, you become a wellspring of wild magic while you are raging. While under the effect of Shattering of the Veil, your Lingering Magic deals maximum damage, with no rolls required, and your weapon attacks score a critical hit on a roll of 19 or 20.