Path of the Blessed.

Sir Brian of Doncaster was the first to follow the Path of the Blessed. Before becoming a famous knight and explorer, he was known on the stage for his loud voice, and Barbarians that follow in his path will embody his loudness in combat.

Cacophonic Shock

From third level, you may channel your rage into a eardrum-bursting shout. As an action while raging you may yell in a 15 foot cone. All creatures within the cone must make a Constitution saving throw. The DC for this saving throw is 8 + your Constitution modifier + your proficiency bonus. A creature takes 2d6 thunder damage on a failed save and half as much damage on a successful one.

The damage increases when you reach certain levels in this class; increasing to 3d6 at 5th level, 4d6 at 11th level, and 5d6 at 17th level. You may use this ability a number of times equal to your constitution modifier, after which you may not use it again until you complete a short or long rest.

The Universal Language

They say if you shout loud enough eventually even those that don’t speak your language will understand you. From level Three, any creature that can hear you (even if they do not understand a language) understands you whilst you are shouting. You will not understand creatures that respond in kind.

Gordons Alive!!!

From Sixth level you can use the power of your voice to aid fallen allies. As a reaction to a creature you can see falling to zero health points you may yell their name followed by the word ‘Alive'. The target creature will arise, motivated by your larynx of power to take up arms once more, restored by a number of hit points equal to your barbarian level. You may use this ability again when you finish a short or long rest.

Transcendent Yell

From the tenth level, you become so loud that your shouting can reach beyond the fabric of reality. You may yell at the top of your lungs to cast Contact Other Plane as a ritual. You may also cast Sending as an action without the use of any spell components, however everyone in a 100 foot radius of your target is aware of the contents of the message they have received. Once you have used Sending in this way you may not do so again until you complete a short or long rest.

Credit: Hexicate

Booming Voice

At level fourteen your voice is so powerful that you may compel your enemies to obey your commands. While raging, you may use your bonus action to cast Command without using a spell slot or components. If a creature is frightened of you it automatically fails its saving throw.