Path of the Wilds

The path of the wild barbarian is a dexterity based barbarian that is supposed to be very quick, and a bit more roguish then a normal barbarian. Path of the wild barbarian rather than being controlled by their anger, and letting it fuel their strength control it, and use their intense anger to quicken their movements, and focus on improving their ability to survive in the harsh wilds barbarians typically inhabit. Any additional stuff lore stuff you want to include in your game is up to you, but if I were you I'd keep it close to what I have already given you as, but its not like I can stop you so do what ever you want.

Agile Build

At 3rd level your rage gives you bonus damage to dexterity attacks, and advantage on dexterity checks and saving throws instead of strength. Also at 3rd level you can use strength based weapons as dexterity weapons instead.

At 20th level your primal champion ability gives you +4 dexterity instead of strength. 

Wild Training

At 6th level you get proficiency in stealth, expertise in two skills, an extra attack, and an extra 20 feet of movement. (Rage not required)

Refined Movements

At 10th level you can now use the uncanny dodge ability, so when an attacker that you can see hits you with an attack you can use your reaction to halve the damage. Also at 10th level you can use the cunning action ability to use the dash, hide, or disengage as a bonus action.

Wild Mastery

Starting at 14th level, when you rage you cannot roll less than a 10 on any dexterity, constitution, or attack roll except for death saving throws, and any rolls less then 10 will be counted as 10.