Path of the Cold Fury

Path of the Cold Fury Barbarians are those whose anger, instead of manifesting as a blind rage, succumb to a seething and hyper-focused fury. Pity be upon those who draw the ire of the Cold Fury Barbarian.

The will and intent of the Path of the Cold Fury Barbarians' anger is strong enough to pull upon the natural magics of their surroundings, dropping the temperature of their surroundings in short controlled bursts. This may manifest as additional shards of ice upon their weapons, or even patches of slick ice beneath their enemy's feet. 

Cold and Calculating

Beginning at 3rd level, while raging, your caution and focus grants a +1 to your AC, provided you are not wearing armor. Your focus intensifies, helping ward off attempts to redirect you. You have advantage on all Wisdom and Charisma saving throws while raging.

Extended Chill

Beginning at 3rd level, your attacks manifest the intensity of your cold rage. One per turn, the first attack you land deals an additional 1d6 of cold damage. This feature increases to a d8 at 6th level, a d10 at 10th level, and a d12 at 14th level.

Condensed vitriol

Beginning at 6th level, the frigid anger you emit while raging condenses on the ground around you. Once per rage, as a bonus action, you create a sheet of ice in a 10 foot radius centered on your feet. Any creature, excluding yourself, must succeed a dexterity saving throw (DC = 15) or fall prone. Creatures must repeat this save upon entering the radius, or at the end of their turn if they remained within the area of the effect. The effect lasts for one minute, or half of that if exposed to an extreme heat source.

Freezing Scorn

Beginning at 10th level, you gain better conrol of your rage. While raging,  when all of the attacks you make in a turn miss, the ice that coats your weapons instead of dissipating, builds up and becomes sharper and more lethal. The next attack you land gains additional extended chill dice for every attack you missed on your previous turn, and any missed attacks since. This effect continues to stack until you land a hit, or your rage ends.

Revenge, Served Cold

Beginning at 14th level, you've mastered your Cold Fury. When an enemy makes the unfortunate mistake of landing a critical hit against you while you are raging, as a reaction, your Cold Fury condenses and solidifies on their limbs, rendering them "slowed" for 1 minute. You may use this feature once per rage.