Juggernaut (Aurorian)

Fighters who have learned to use their massive size and force to their advantage have obtained the named Juggernaut. The creatures are seen less a fighters and more unstoppable forces of nature. 

Resilience

Upon using your Second Wind feature, you may also add 1d6 + con modifier in temp hp.

Immovable Object

Starting at 3rd level, you can use your reaction to reduce the damage to an insignificant amount. When you do so, the damage you take from the attack is reduced by 1d10 + your Con modifier + your Fighter level.
If you reduce the damage to 0, you can make one melee attack role with advantage as part of the same reaction.
You can use this ability a number of times equal to your proficiency bonus.

Unstoppable

Upon taking a short or long rest, you gain temporary hit points equal to your fighter level.

Unyielding

You count as one size large when it comes to carrying capacity

Inspiring Titan

Upon using your Second Wind or Action surge feature, all allies within 30 feet of you gain your fighter level in temporary hit points. You may use this ability once per short rest.

A Walking Mountain

You may sacrifice your defenses to toughen your resolve. As an action, your may sacrifice your armor class to gain temporary hit points. For every 2 armor class you sacrifice, roll a d12 of temp hp. You can do this for up to 5d12 temporary hit points. Once your temp hit points p from this ability runs out, your Armor class returns to normal. You can use this ability 2 times per long rest.

Mountain Splitter

Once per turn, upon hitting with a melee attack roll, you may use this ability(free action) to deal as much damage as you have temporary hit points.
You may use this ability 3 times per long rest.