Path of the Glass Cannon

for some barbarian the best defense is an overwhelming attack 

The best defense...

Starting when you choose this path at 3rd level, You gain 2 cristal dice(level 3 2D12 at level 6 3D12 at level 10 4D12 and at level 14 6D12) that you can spend will raging to add to your damage, if you kill a creature you regain 1 cristal dice, however when you use a cristal dice you gain disadvantage in all saving rolls for a round.

Aditionally you can spend a cristal dice to imbue your weapon with any kind of magic damage until the end of combat and if you want a new imbue you have to spend an aditional glass dice

The speed fury

Beginning at 6th level, while in rage if you hit a creature you become faster gaining and aditional 10 speed(at level 8 15 at level 10 20 at level 12 25 and at level 14 30 speed) for 2 rounds unless you hit someone again. Aditionally you can spend one cristal dice to activate the speed.

Intimidating speed

Beginning at 10th level, while you are running you can do your bonus action to try frighten a creature that is at maximum of 40 feet away of you. The creature must succeed on a Wisdom saving throw (DC equal to 8 + your proficiency bonus + your feet divided by ten ) or be frightened of you until the end of your next turn.

If the creature succeeds on its saving throw, you can’t use this feature on that creature again for 24 hours.

Close & personal

Aditionally 10th level, when you take damage from a creature that is within 5 feet of you, you can use your reaction to make a melee weapon attack against that creature adding one of your Cristal dice

The Embodiment of a Scarlet Devil

At the start of the 14th level, you can start a unique type of fury at the cost of all your current hit points, when you activate it you lose all your hit points but become inmortal for 2 rounds, when the fury ends you can use relentless rage to get back into the fight but in a normal rage and with 2 exhaustion, if you fail the roll you become stabilized, either way you only can ragain hit points in rest.

Aditionally all the hit point expended are transformed into damage added to your weapon and you have always advantage in all attack rolls.