Some manned instruments of war require their user to have superior physical prowess to overcome their weight and encumbrance. Though usually these weapons may take an entire crew to employ, those fighters who choose to wield heavy weapons use their powerful bodies, and powerful armaments, to overwhelm their foes. 

Steady Stance

You have learned to use the heft of your weapon to root yourself in place. At 3rd level when you adopt this path, you can use heavy weapons without incurring disadvantage due to your size.

Additionally, at the end of your turn, if you move less than half your speed while wielding a weapon with the heavy property, until the end of your next turn, you have advantage on saving throws to avoid being restrained, moved or knocked prone.

Pummeling Rage

At 3rd level, you leverage your immense strength with persistent focus. While you are raging, whenever you hit the same target with your Attack action in consecutive turns, you can force that creature to make a Strength saving throw (DC equals 8 + your proficiency bonus + your Constitution modifier). On a failed save, the target is pushed 5 feet back, and falls prone.

You can use this feature a number of times equal to your proficiency bonus, and you regain all expended uses when you finish a long rest.

Big Stick Diplomacy

Starting at 6th level, you know how to use either reputation, or the sheer size of your weapon to strike fear in those around you. You can add your Strength modifier to any Charisma (Intimidation) check you make while wielding a weapon with the heavy property. Consequently, as a bonus action, you can attempt to demoralize hostile a creature you can see within 30 feet of you that can see and hear you. Make a Charisma (Intimidation) check contested by the target's Wisdom (Insight) check. If your check succeeds, the target is frightened of you until the end of your next turn. 

You can use this feature a number of times equal to your proficiency bonus, and you regain all expended uses when you finish a long rest.

Stand Tall

At 10th level, your unbending will for carnage makes it harder for you to go down in a fight. While you are raging, you gain immunity to being restrained, moved or knocked prone.

Denunciatory Might

Beginning at 14th level, whenever you use the Big Stick Diplomacy feature, you can effect an amount of creatures equal to your proficiency bonus.

Additionally, any creature that is within 10 feet of you and fails to beat your Intimidation check becomes paralyzed, as well as frightened, until the end of your next turn.