Path of the Gargantuan

Through years of ferocious combat and physical feats, the Gargantuan barbarians have learnt to harness their incredible strength and might, by wielding 2 great weapons in combat, while unleashing all that untapped power, they can channel their rage to physically grow in size. Although devasting, it requires unmatched strength and endurance which can leave the Gargantuan in a vulnerable state, if anything is still alive to take advantage of that.

Gargantuan Might

Starting when you choose this path at 3rd level, your unparalleled strength, allows you to wield 2 great weapons of your choice in combat. You gain the full benefits of 2 weapon fighting when using 2 great weapons. When you enter rage, your second attack on your off hand weapon also gains your ability modifier when calculating damage.  

Wielding 2 great weapons takes immense strength meaning if you use your bonus action to make a second attack with your offhand weapon, any attacks against you after your turn gain advantage.  Additionally, you can no longer use reckless attack, while wielding 2 great weapons.

Indominable Defence

Starting when you choose this path at your 3rd level, wielding 2 great weapons makes your defense equally as good as your offense. Gain additional ac equal to your strength modifier. Any condition that would not allow you to attack, you lose this benefit until it has ended and or are no longer using 2 great weapons.

Pulverise

Beginning at 6th level, when you enter rage, you can choose to use Pulverise instead of making an attack.  Expend all your fury and might into a devasting attack, slamming both of your great weapons into the ground, bringing forth a terrifying shockwave, wrecking everything in its path. When you use Pulverise, all creatures in a 20ft cone must make a strength saving throw (dc equal to 8+ your strength modifier + your profiency bonus).  A creature takes 4d8+ your strength modifier in damage and is knocked down on a failed saving throw. If they make a successfull saving throw, damage is halved and they resist being knocked down. The damage increases to 5d8 at 11th lvl and 6d8 at 16th lvl.

Pulverise requires every ounce of strength you have in you, meaning you are unable to make any bonus actions for the rest of your turn as well as being incapacitated on your next turn. It can only be used 1 time while raging.

Monstrous Physique

Starting when you choose this path at your 9th lvl, your unrelenting rage is unleashed allowing you to grow to monstrous proportions. When you enter rage, no matter your size, your physique will grow into a large category.  While you are increased in size, your max pulling and lifting weight is doubled. 

Mighty Fortress

Beginning at 14th level, years of battle and unrivalled strength has transformed your body into a hulking fortress of muscle and power, breaking the limits of what would normally be possible. Your maximum strength ability score is increased by 2 (this bonus is also applied on top of a potential lvl 20 barbarians max of 24 meaning you now have a potential max of 26) and you gain 2 additional strength.

When you enter rage, your monstrous proportions allows you to brush off excessive amounts of damage gaining temporary hit points equal to 4d6 + your constitution modifier. While your proportions are monstrous, so is the rage coursing through your body. The sheer amount of it, has now overflowed through the very weapons in your hands, turning them into oversized hunks of wood and steel.

While in rage, your great weapons become Gargantuan weapons. Extend your attack range by 5 ft when using great weapons and your attacks now deal additional aoe damage around the primary target. Creatures within a 5ft radius (includes allies but not yourself) of the primary target, take 1d4 + your strength modifier of force damage. Creatures must make a strength saving throw equal to dc 8 + your strength modifier + your profiency bonus otherwise they take full damage.