Path of the Mountain Breaker

This subclass will focus on barbarians using unarmed combat while using their rage to bolster their attacks and temp hp.

Level 3: Mighty Fists

At 3rd level when you pick this subclass, your unarmed strikes do 1d8 dmg, 1d10 at level 8, 1d12 at level 13, and your rage bonus is doubled while raging. 

Furious Build

At level 6 Your rage strengthens your body beyond normal limits enhancing your fighting prowess . Your unarmed attacks count as magical for the purpose of overcoming resistances. You also count as one size larger for pushing, lifting, dragging and your carrying capacity is doubled. While raging you may roll 1 barbarian hit die and gain temporary hit points equal to the number rolled plus your rage bonus. You may use this feature once per turn and a number of times equal to your Con modifier and regain this feature after a long rest.

Strength Beyond Reason

At level 10 Your bloodlust and ferocity exhume from your very being. When making an intimidation roll you can use your Strength instead of charisma and have advantage on intimidation checks made against you. Additionally while raging, as a bonus action you can force a target that you've attacked to make a wisdom save (DC = 8+Str+Prof) on a failed save they are hit with the Fear effect until the end of your next turn. You can use this ability once per turn and as many times equal to your con modifier. Regain use after long rest.

Mountain Breaker

At level 14 you've master the extraordinary might inside you. You can now land crits on a 19. Additionally when you make a successful attack you can move the target 15ft in a direction of your choosing. Your Mighty Fists feature also gains the siege property.