Earth Shaper

Some barbarians find some druidic solace in their primal path. Those who walk the Path of the Earth Shaper, have mastered the ability to manipulate and shape the earth bellow them through their rage. The source of their powers depends on their origin. You can choose the origin of your earth powers or determine it by rolling on the Origin of the Shaper table

1. You come from a druidic culture, and mastered to shape your rage by training.
2. Elemental influence of the Earth Plane has affected you in some way, giving you the rock manipulating abilities.
3. Living in seclusion for a long time, you attuned yourself with the land, finding a way to shape the nature's wrath.
4. You don't know the source of your powers.

 

Bouldercraft

Starting when you choose this path at 3rd level, your mastery of earth has granted you special abilities.

You can roll a d4 in place of the normal damage of your unarmed strikes.
When you enter your rage, you can conjure a weapon that lasts until your rage ends. Other creatures lack proficiency to wield these weapons effectively.
Rock fists - Each fist counts as a melee weapon with light property that deals 1d6 bludgeoning damage. You can't be disarmed from those weapons.
Boulder Hammer - Long two-handed weapon that deals 1d10 bludgeoning damage on hit.

Stone Stance

Beginning at 6th level, you cannot be moved against your will, and can't be knocked prone while raging.

Greater Bouldercraft

Beginning at 10th level, the earth weapons you conjure are stronger.
Your unarmed strikes damage die becomes d6, the damage die of Rock Fists become 1d8, and Boulder Hammer damage die becomes 2d6

Additionally, once on each of your turns, when you deal bludgeoning damage to another creature with an attack, you can cause that creature to make a Strength Saving Throw, making them fall prone on a failed save.
The DC is equal to 8 + Your proficiency bonus + Your Strength Modifier

Time to Rock

Starting at 14th level, you master shaping earth to fight alongside you. When you enter your rage, you can use your action to create an earthly copy of yourself. It uses the (earth) Elemental Spirit stat block from the Summon Elemental spell, except it's size is the same as yours at the moment of creating it. It shares your initiative count, but takes it's turn immediately after yours. You don't need to maintain concentration on it, but it disappears when your rage ends. You can use this feature once, but you regain the ability to do so when you finish a short or long rest.