Frostlorn Defender 3

The path of the frostlorn defender is one where barbarians imbue their body with ice. in battle ice merges from their body and armor; providing them with both defensive and offensive abilities.

Frozen armor

while you are raging the ice protects you giving you a bonus to ac equal to +1 at lvl 3, +3 at 10, and +5 at 15. In addition when an enemy attacks you, you can use your reaction to slow their speed by 5 at lvl 3, 10 at lvl 10, and 15 at lvl 15. At lvl 15 you can also have your opponent make a con save dc 10 plus your con mod if they fail they are frozen in place until they pass a dc 15 strength check to break free from the ice. You may also roll a d4 for unarmed damage in place of regular unarmed damage. the damage is cold. Increasing to d6 at 10 and d10 at 15.

Tundra Walker

You gain immunity to all cold damage while raging and when you are hit with cold damage you instead regain hit points equal to your con mod. In addition while raging you ignore all cold and ice related rough terrain

Glacial Resilience

you become immune to any spell or effect that would alter your form against your will and gain resistance to all attempts to move you or knock you to the ground.

Walking Avalanche

Starting at 14th level you can cause ice to erupt from you and strike out at others. Once per rage, you can use your action to magically send out an explosion of ice and frost in a 20 foot radius centered on you. Each creature inside must make a con save. On a failed save, they take 5d10 plus half your barbarian level in cold damage, and are slowed by ten feet until your next turn. On a successful save they take half damage and aren't slowed. When you use this feature your rage cannot end as a result of not attacking another creature until the end of your next turn.