Path of the Mobile Fortress

You can withstand the siege of the world. Like a walled city with a fortified castle and an army to guard it, no matter what gets thrown your way, you stand!

Density

Starting at 3rd level, when you enter a rage you gain a bonus to your AC equal to your rage damage bonus.

Robust

When you reach 6th level, as you enter a rage you gain temporary HP equal to your Proficiency Bonus times 3. You also don't succumb to mental attacks as easily, you can add your rage damage bonus to all Intelligence, Wisdom, and Charisma Saving Throws while raging.

Unscalable

Once you reach 10th level, you can no longer be grappled. Also, while you are raging, you can not be forced prone, and non-magical difficult terrain does not affect your movement.

Bulwarked

Starting at 14th level, you now have resistance to bludgeoning, piercing, and slashing damage even when not raging. Additionally, while raging you are immune to psychic damage, and resistant to all other damage.