Starting at 6th level, you may benefit from your Fast Movement bonus speed while wearing heavy armor, and you are considered 1 size category larger for the purposes of shoving and moving through a hostile creature's space. You are an unstoppable force, and no creature can impede you from your chosen path. Additionally, while raging, once per turn you may deal an additional 1d4 damage with a melee attack from a heavy melee weapon.

At 3rd level, you gain proficiency in heavy armor, and you may gain the benefits of Rage while wearing heavy armor. You excel at fighting in the heaviest armor and while using the heaviest weapons, leaning to use their weight to your advantage. To a barbarian of the Iron, steel isn't just what he shapes into his weapons and his armor, it lies in his very heart and soul. With the discovery of steel, man gained a nearly unparalleled ability to carve his way into the world around him, and through the beasts and enemies that held him at bay from the darkest reaches of the world.

Of all the innovations man has made over the years, one would be hard pressed to find a more significant invention than steel. Additional note: The feat was originally written by Ralnar on the GitP boards.

Path of exile iron grip