Path of Iron

You excel at fighting in the heaviest armor and while using the heaviest weapons, leaning to use their weight to your advantage. Crafting and metalworking are in your heart, your blood, and your soul. You are an unstoppable force, and no creature can impede you from your chosen path. Though massive, your armor and weapons are but tools for your greatness; it is you who is larger than life. 

Iron Frenzy

At 3rd level, you gain proficiency in heavy armor, and you may gain the benefits of Rage while wearing heavy armor. Additionally, While raging, once per turn you may deal an additional 1d8 damage with a melee attack from a Heavy melee weapon.

Riddle of Steel

At 6th level, You gain proficiency with Smith's Tools, and while crafting armor or weapons you make progress at a rate of 50 GP per day. Additionally, you retain your Fast Movement Bonus while wearing heavy armor.

Juggernaut

Starting at 10th level, while wearing heavy armor, you are considered 2 size categories larger for the purposes of shoving and moving through a hostile creature's space. If you move at least ten feet in a straight line before attempting to move through a hostile creatures space, you do not treat that space as difficult terrain, and you do not provoke an opportunity attack from that creature.

Iron Giant

Starting at 14th level, while wearing heavy armor and raging, you gain the benefits of the Enlarge spell, though it is not a magical effect and cannot be dispelled. This effect ends when your rage ends. Additionally, you gain the benefits of the Brutal Grip Feat.

Brutal Grip:

+1 Strength not to exceed 20

When wielding a versatile weapon in one hand, you may use the two-handed damage die.

You may wield a two-handed melee weapon in one hand, though you take a -2 to hit on all attacks with that weapon.