Comments from the Finger: In my mind, most of the characters of the Wild West genre are barbarians of some sort, but the rugged frontiersman is the single best example of this.
Path of the Mountain Man
You are a frontierman, hardened by your choice to live far beyond the outskirts of civilization in the rough wilderness. Though you rarely enjoy human contact, you are a skilled hunter and survivalist, and prefer to work and live alone.
When you select this path at 3rd level, you become proficient in the hunting rifle.
At 3rd level, as a bonus action while raging, you can take a swig of moonshine to bolster your courage and toughness. Until the beginning of your next turn, you have advantage on Charisma, Intelligence, and Wisdom saving throws, and gain a number of temporary hit points equal to your level. After using this ability, you cannot do so again until after ending your rage.
At 6th level, you are adept at navigating the wilderness. You have advantage on Dexterity (Acrobatics) and Strength (Athletics) checks made to climb, jump, swim, or otherwise navigate natural terrain.
By 10th level, you can sound a blood-curling roar to terrify your foes. You begin a Fearsome Yell as a bonus action and can continue to yell as a bonus action on your turn, up to a duration of 1 minute. While doing a Fearsome Yell, each creature adjacent to you must make a Wisdom saving throw (DC equal to 8 + your bonus to Intimidation). On a failed save, the creature has disadvantage on attack rolls against you until the end of its turn. On a success, the effect ends for that creature and it is unaffected by this ability for 24 hours. At the end of each of its turns, affected creatures can make another Wisdom saving throw to end this effect. After beginning a yell, you cannot do so again until you finish a short or long rest.
You have advantage on Intimidation checks while you are making a yell.
At 14th level, you can shrug off punishment like a true son of the mountain. As an action while you are raging, you become immune to nonmagical bludgeoning, piercing, and slashing damage, and gain resistance to all other damage until the beginning of your next turn. After using this ability, you cannot do so again until you complete a short or long rest.
Changelog: 7/22/15: Liquid Courage changed to once per rage. Also, some rephrasing.