Path of the Brr-Zerker

Cold means nothing to you, you embrace it, you are it, the cold fuels your rage till your body gives off arctic winds that freeze your enemies.

Rage of the Ancients

Starting when you choose this path at 3rd level, you can channel freezing blasts into your melee strikes. While Raging, your melee attacks deal an additional 1D6 cold damage. You may also treat your Rage damage as Cold.

This damage increases to 1D8 at Barbarian level 14.

Cold Snap

Your control over cold protects you. You gain resistance to cold damage while Raging. Furthermore you have advantage on skill checks to survive cold environments.

Ancestral Frost

Starting at level 6 your icy blasts can begin to freeze enemies. When you strike a creature with a melee attack while Raging you may force them to make a Wisdom save against your Constitution DC {{savedc:con}} If they fail they are under the effect of the slow spell, this does not require concentration.

You can only use this ability a number of times equal to your proficiency bonus and must finish a long rest to regain these uses.

Blast Chill

Starting at level 6 you can freeze your enemies solid and shatter them. While Raging as an Action, you may target a creature within 60 ft and force them to make a Wisdom save against your Constitution DC {{savedc:con}} , if they fail they are paralyzed for 1 minute. They may repeat this save at the end of each of their turns ending the effect on a success.

You may only use this effect once and must finish a long rest to do so again.

Dreadwind

Starting at level 10 you can become a wirling tornado of snow and blades. As a bonus action you may cast Ashardalon's Stride  but it deals cold damage and it allows you to ignore difficult turrain. You may cast this even while Raging.

You may only use this ability once and must complete a long rest to do so again.

Feral Surge

Starting at level 10, as part of the bonus action you use to activate Rage, you may perform a leap in any direction a distance up to your movement. When you land a blast of cold billows out from you. All creatures within 5 feet of where you landed must make a Dexterity saving throw against your Constitution DC {{savedc:con}}. Creatures take 2D8 cold damage and are stunned till the start of your next turn on a failed save or half damage and no other effect on a success. Should this damage bring any creature to 0 hit points, you regain one of your spent Rages. 

Ice Breaker

Starting at 14th level, when you deal melee damage to an enemy, you deal bonus damage depending on how frozen they are. You deal an extra 1d6 cold damage against slowed creatures, 1d8 against stunned creatures and 1d10 against paralyzed creatures.

Unyielding Ancient Fury

Starting at level 14 while Raging as a Bonus Action, you may cast Armor of Agathys at level 3. When you do this, if your current hit points are less then half your maximum hit points, you may heal for 2d6 plus your Constitution modifier.

You can cast this spell in this way once and must finish a long rest to do so again.