There are those barbarians who stride the battlefield, clad in the heaviest of armours. Not merely to protect them from harm, but for the destructive might they can bring to their enemies with it. Clad in heavy armours, Juggernauts are giant physical presences on the battlefield, charging headlong towards their foes, smashing into them with a resounding crash of metal and the screams of the unlucky. The fury of a Juggernaut burns hot, protected from harm and driven to great excesses as they continue to strike foes down.

Iron Within, Iron Without

At 3rd level, you become an overwhelming force on the battlefield, slamming into your foes like a battering ram. While you are raging and wearing armour made of metal, you deal an extra 1d6 bludgeoning damage to the first creature you hit on each of your turns with a melee weapon attack. This damage increases at 11th level, to 2d6.

As well as this, whilst you are wearing medium armour, instead of adding your Dexterity modifier to the base number from the armour type to determine your Armour Class, you may add your full Constitution modifier to the base number instead to determine your Armour Class. 

Metal Furor

At 3rd level, you learn how to care for and maintain your armour. You gain proficiency in Smith's tools.

Mighty Onslaught

At 6th level, you throw yourself into fights, slamming into your foes at great speeds. When you take the Dash action on your turn, you may make one melee weapon attack as part of the dash action. If you move 20 feet before making this attack, you may double the amount of extra damage die from your Iron Within, Iron Without feature and your weapon attack scores a critical hit on a 19 or 20.

Steel Will

At 10th level, your mind is armoured, as you are so single-minded in the pursuit of your foes. You gain proficiency in Wisdom saving throws.

As well as this, whilst raging, whenever you succeed on a Wisdom saving throw due to a creature casting a spell, that creature suffers Psychic damage equal to twice your rage damage bonus and you are immune to any magic that allows other creatures to read your mind.

Wrought Endurance

Starting at 14th level, you are a huge figure on the battlefield, dominating it with your presence. You are a pillar of endurance, blows seeming to not harm you.When you take damage, you can use your reaction to roll a d12. Add your Constitution modifier to the number rolled, and reduce the damage by that total. You may do this a number of times per long rest, equal to your Constitution modifier.