Path of the Eternal Blizzard

High up in the mountaintops, these ancient tribes of barbarians have spent eons honing their skills and hardening their forms to not only survive in the harsh winds of the eternal blizzard, but harness its powers and thrive. Barbarians of the Path of the Eternal Blizzard have become inured to all threats, unleashing flurries of freezing winds and icy powers to demolish all in their paths.

Whisp of the Storm

At 3rd level, when you enter your rage you summon a whisp of the Storm to fight alongside you.
While Raging you gain resistance to Cold Damage.
As part of the Bonus Action you use to enter your Rage, and on consecutive turns with your Bonus Action, you can command your Whisp to move and make an attack roll against one creature.
The whisp is a small Undead with a flying (hovering) speed of 30 feet.
The whisp has a number of hitpoints equal to your Barbarian Level + Proficiency Bonus, AC of 13 + Proficiency Bonus.
The whisp has resistance to Cold damage and non-magical Bludgeoning, Piercing, and Slashing Damage.
The whisp has vulnerability to Fire Damage.
The whisp has a +0 in all ability scores.
When reduced to 0 hitpoints, the whisp fades away.

Actions

Frigid Grasp: Melee Weapon Attack: your STR / DEX modifier to hit, reach 5 ft., one target you can see. Hit: 1d8+PB Cold Damage.

Cooling Winds: Choose a creature within 60 ft you can see, that creature regains 1d8 + CON modifier temp hitpoints.

Frozen Soul

Also at 3rd level, you can call upon the Eternal Blizzard to aid your offensive assaults.
As a Bonus Action, you can cover one weapon you are wielding in blue ice. This ice lasts for 1 minute before thawing.
While this ice is present, all attacks made with the covered weapon deal an additional 1d8 Cold Damage. 

This damage increases at later levels, 6th level (2d8), 10th level (3d8), and 14th level (4d8)

You can use this special Bonus Action a number of times equal to your Proficiency Bonus, regaining all spent uses when finishing a long rest.

Spellcasting

In addition to your frozen weapon, you can now cast a small number of spells descended from the Eternal Blizzard.
You gain a number of spell slots equal to your CON modifier + Proficiency Bonus.
These spells use your CON modifier as their spellcasting modifier, and ignore the restriction on casting and concentrating on spells while Raging.
At 3rd level your spell slots are all of 1st level. This increases at later levels: 6th level (2nd level spell slots), 10th level (3rd level spell slots), and 14th level (4th level spell slots).
Spell Save DC = (8 + Proficiency Bonus + CON Modifier)

Cantrips.
You gain the Frostbite and Ray of Frost Cantrips.

Spell List.
You gain the Spells Ice Knife and Armor of Agathys.

Frozen Bulwark

At 6th level, the power of the blizzard has granted you protection from those that would wish to burn you away.
While Raging, you gain +2 AC as icy formations coat your body.
When you take the Attack Action, you can choose to replace one of your weapon attacks granted by your Extra Attack feature to instead cast a Cantrip.

Spellcasting.

You learn 2 new Spells:

Rime's Binding Ice and Snilloc's Snowball Storm.

Unending Blizzard

At 10th level, You become an unstoppable force of nature, a snowstorm given flesh.
When you damage an enemy with a weapon currently under the effects of your Frozen Soul feature, that creatures movement speeds are all reduced by 10 feet until the start of your next turn.
While Raging, your movement speeds cannot be reduced in any way.

Spellcasting

You gain the following Spells:

Sleet Storm , Wall of Water and Slow.

Living Hailstorm