Path of the Dreadnought

The unstoppable soldiers of wartorn battlegrounds, it is
the duty of the dreadnought to break enemy lines and
raze entire cities. Each dreadnought wears an advanced
helmet, a Berserker Helm, which, once donned, is never
removed. Each helm is specially engineered to make the
dreadnought fearless and to grant them complete control
over their terrible rage. The helmet is the locus of their
emotion, or lack thereof.
To a dreadnought, reality is simple: there are friends
and foes, good and evil, law and chaos. The rule above all:
never remove your helm.

Berserker Helm

Beginning when you select this path at 3rd level, you are
fitted with a helmet which regulates your emotion and
focuses your anger. Assisted by your helmet, you can
summon up rage at will, and end it just as swiftly. You
are unable to rage if your helmet is removed. Instead of
raging normally, you can rage for a number of rounds
equal to your half your barbarian level (rounded down)
+ double your Constitution modifier. These rounds need
not be consecutive. You can begin and end your rage as
a bonus action. Your rage only ends early only if you fall
unconscious or if you choose to end it on your turn. After
raging for this number of rounds, you must finish a short
or long rest before raging again.
At 20th level, you can rage for any number of rounds.

Fearless

At 6th level, you have advantage on saving throws against
being charmed or frightened. If you make this saving
throw while you are raging, you can reroll one of the d20s
once.

Unstoppable Charge

Beginning at 10th level, when you use your action to
Dash, you can use a bonus action to make one melee
weapon attack or to shove a creature.
If you move at least 10 feet in a straight line
immediately before taking this bonus action, you have
advantage on this attack roll.

Focused Rage

At 14th level, you can focus your rage into an unstoppable
fury against a single target. When you enter a rage, you
can choose 1 creature that you can see within 60 feet. Your
attacks deal twice the normal amount of rage damage to
this target.