Paragon of Khashak

One of Umash's children in the legends, Khashak was not a deity in the normal sense, but a historical figure who led a long-lived orcish rebellion in the Drakovian mines on the western edge of the Dragonspine mountains more than 1,000 years ago. In many ways responsible for the proliferation of free orc camps in the mountains, this rebellion was led by Khashak and his cadre of elite warriors, trained in heavy armor and the double headed battle staff, with a wicked axe blade on either end. Working in the midst of Umash's more prototypical barbarian storm skirmishers, the Paragons wade into the lines of their foes, whirling the double axe in sweeping arcs, hacking into enemy warriors and drawing attacks to their heavily armored hides while their fellows flow around them, dispatching their occupied foes.

The orcish battle staff is a haft of heavy, leather-wrapped wood supporting a wicked, bearded double axe head on either end. The weapon has the properties heavy, two-handed, and special,* does 1d10 slashing damage on a hit, and weighs 10 lbs. Proficiency with a battle staff allows you to add your proficiency bonus to the attack roll for any attack you make with it. A battle staff in the hands of a non-Paragon of Umash would most likely be assumed by orcs or half orcs to have been stolen or looted from a fallen foe, and a Paragon of Umash will almost certainly feel entitled to demand its return or challenge the bearer to prove they’re worthy to wield it.

*Special: If you attack with an orcish battle staff as part of the attack action on your turn, you can use a bonus action immediately after to make a melee attack with it. This attack deals 1d8 slashing damage on a hit, instead of 1d10.

Blade-drawing strike

Starting at 3rd level, you can use your sense of invulnerability to recklessly draw the attention of your foes, making it easier for your allies to strike them down. When making a melee strike against a foe or group of foes, you can choose to make a blade-drawing strike. Doing so gives your allies advantage on any target within 5 ft. of you, but attack rolls against you have advantage until your next turn.

Line-breaking strike

Starting at third level, you begin to master the battle staff's double axe heads. When multiple enemies are in your threatened range, you may make a second melee attack after the first attack against a separate target than the initial attack. 

Daunting blade shield

Beginning at seventh level, you learn the technique of presenting an intimidatingly fast, intricate spinning pattern of the battle staff, making it a challenge for enemies to slip attacks in on you. As a bonus action you can create a daunting wall of spinning battle staff, making it more difficult for any opponent within 5 feet of you to attack. The target must succeed on an Intelligence saving throw against a DC equal to 8 + your proficiency bonus + your Strength or Dexterity modifier. On a failure, they have disadvantage on any melee or touch-ranged spell attacks they make against you until the start of your next round. 

Umash's glare

Beginning at tenth level, you can channel your imposing battle prowess and intimidating battle staff patterns to spend an action and attempt to frighten one creature that you can see within 30 feet of you. If the creature can see or hear you, it must succeed on a Wisdom saving throw (DC equal to 8 + your proficiency bonus + your Charisma modifier) or be frightened of you until the end of your next turn. On subsequent turns, you can use your action to extend the duration of this effect on the frightened creature until the end of your next turn. This effect ends if the creature ends its turn out of line of sight or more than 60 feet away from you.

If the creature succeeds on its saving throw, you can’t use this feature on that creature again for 24 hours.

Sphere of retribution

Starting at fifteenth level, the blur of dual axe heads becomes dangerous to your enemies. When a creature within 5 feet of you hits you with a melee attack, that attacker takes 3 points of slashing damage if you are not incapacitated and are wielding a battle staff. 

Implacable foe

Beginning at eighteenth level, you can channel your dedication to your cause into the ability to hold your ground even under a rain of enemy blows. If you are an orc or half orc, the use of Relentless Endurance will bring you to half hit points instead of one hit point. If you are any other species, you gain the use of Relentless Endurance as written. Once you use the Implacable Foe feature, as for Relentless Endurance, you can't do so again until you finish a long rest.