Most barbarians tend to invoke the spirits of animals to obtain their ferocious strength in combat, only a few may attract the attention of higher beings. Countess legends portray hero's and villain's gifted with unearthly rage and strength that forever changed the world. For whatever reason it may be from specific characteristics to heritage and birth rights you have been chosen.

A worthy warrior

Whatever reason it may be you have caught the attention of a higher being and are granted some of their strength. perhaps you are charged with a task or a particular blood thirstiness appeases them.

Vicious charge At 3rd level, while in rage you throw yourself into fights with an unearthly rage, 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 damage.

Undying rage on 3rd level when your hp is reduced to 0 the deity calls out to you whispering gently at the back of your conscious giving you new strength, you have advantage on the saving death roll, if you succeed on the saving death roll you can lash out to the nearest opponent. Make an attack roll and if it hits the creature, you gain health equal to the damage you’ve dealt. Can only be used once per long rest.

Guidance of the spirit At 6th level you are able to commune with deity that influences your soul. Through this you become proficient in insight and through meditation you can cast Augury without using a spell slot or material components

Roar of the savage spirit At 10th level the deity influence over you has empowered you with the ability to roar with the voice of inhuman rage. After killing a creature you are filled with bloodlust and let out a roar. Any creature within 15ft of you must make a wisdom saving throw (DC equal to 8 + your proficiency bonus + your charisma modifier) or become frightened of you. You gain advantages on rolls against frightened creatures. You can only use this ability twice per long rest.