The charge of a mounted Barbarian is as grand and glorious as the break of dawn, and the blowing of their horns resounds from the mountains to the Sea. All who stand in their way shall break by the blow of the axe, runthrough by the might of their spear, cut a sunder by their sword or be trampled by the thundering of hoves.
Source: Adventures in Middel Earth
Mounted Combat
Beginning at 3rd level, if you are mounted, you deal an extra 1d4 damage when you hit an unmounted Medium or Small foe with a melee attack. If you take the Dash action in combat, you add an extra 1d6 points of damage for the first attack you make that round.
Mighty Spear-Throw
At 6th level, when you throw your spear with advantage, you automatically inflict maximum damage instead of rolling the dice. If you are mounted, you do not gain disadvantage when throwing your spear at long range.
Devestating Charge
Beginning at 10th level, if you use your dash action to charge at a creature and attck it, that target must succeed on a DC 8 + your Strength modifier + Proficiency Bonus Strength saving throw or be knocked prone. If the target is knocked prone from this attack, you regain your expended action.
When mounted, you may use your mounts Stregnth modifier instead of your own, and it can use its bonus action to make a attack if the target is prone.
You can use this feature a number of times equal to your proficiency bonus, and you regain all expended uses when you finish a long rest.
Horns Wildly Blowing
At 14th level, you can inspire your allies. At the start of a combat, you may blow your horn or shout a battle-cry. If you do, a number of allies equal to 1+ your Charisma modifier gain the benefits of your Reckless Attacks feature.
If an ally makes a Reckless Attack, they get to add your Rage Damage bonus to their damage rolls.
