Path of the mountain

Barbarians that follow the path of the mountain have developed a connection to the element of earth, maybe they were born of a clan of dwarves that follow ways and traditions as old as the mountains they live in, developing a sacred and traditional bond, developed a bond with a group of friendlya and inteligent earth elementals, these have a deep and personal connection, or were enslaved by evil earth elementals, and once you scapped learned to channel the power from within the scars left by your captors, developing a deep hatred for those that harmed you.

Mountain Armor

Starting at 3 level when you choose this path, whenever you rage, if you are not wearing armor, a layer of stone and rock surrounds your body, protecting you from harm, giving you an amount of temporary hit points equal to your constitution score, while you have any of this temporary hit points you gain a +2 to your AC. Also at this level you can also understand, speak, read and write Terran.

Burrower

At 6 level you gain tremor sense up to 30 feet from you and burrow speed equal to your movement speed.

Stone Strength

At 10 level you gain immunity to the petrified condition and while raging on the ground, you deal an extra d8 to damage dealt with any weapon attack, the extra damage is of the same type as the weapon dealing it.

Top of the mountain

At 14 level while raging you gain the temporary hit points from your mountain armor feature at the start of every turn, on top of that while you have any temporary hit points from it you gain resistance to fire, lighting, cold and acid damage.