Path of the Apex

Barbarians who walk the Path of the Apex draw their rage from an unending hunger ravaging within their souls. The hunger that bursts forth in the throes of rage, manifesting an innate fear in all who they call prey.

Such a barbarian might be inhabited by a primal Predator spirit or have close relationships to such creatures blood or not. You can choose the origin of your inner Apex Predator or determine it by rolling on the King of Hunt table.

King of the Hunt

d4	Origin
1	One of your parents is a lycanthrope or vampire, and you've inherited some of their curse.
2	You are descended from a mad archdruid and inherited their feral powers.
3	A god of the Hunt gifted you with these abilities to honor him as his Champion.
4	An ancient predators spirit dwells within you, allowing you to walk this path.

Carnivore

Starting when you choose this path at 3rd level, you can let your hunger consume you when you rage allowing the aura you release while raging to form large phantom like jaws which empower you and intimidate your your foes. If you do so, for the duration of your rage you can make a single bite attack  dealing 1d6 piercing damage + your Strength modifier as a bonus action on each of your turns, on the turn you enter your rage you may make one of these bite attacks as a part of entering your rage. Going forward you may also make Intimidation checks using your Strength instead of your Charisma while raging. 

If you have a bite attack from a different feature you may substitute it for the bite attack in this feature.

When you perform a Critical hit weapon attack which deals slashing damage you may make a single bite attack as a Reaction at the same creature healing you for the damage done by the bite attack.

Starting at level 6 when you enter your rage and allow your rage to consume you enemies within 30ft of you which can hear or see you must make a Charisma Saving Throw vs (Your Strength Modifier + Your Proficiency Bonus + 8) if a creature fails this save they become frightened of you until the end of your rage.

Ambush

Beginning at 6th level,  you are at your deadliest when you get the drop on your prey. Your attacks perform critical hits on rolls of 19-20 against any creature that hasn't taken a turn in the combat yet. Your attacks against creatures which are under the Frightened condition also benefit from this expanded critical hit range even if they have already taken a turn this combat.

At level 10 the critical range increases to 18-20.

Thrill of the Hunt

Beginning at 10th level, your movement speed increases by 10ft, on your first turn in combat this bonus is doubled or if you are chasing after a creature which is under the frightened condition.

Tyrant

Starting at 14th level, you gain bonuses for each number of creatures which are frightened within 60ft of you.

1 Creature: You gain Temporary HP equal to your Barbarian Level + your Proficiency Bonus.

2 Creatures: You gain a +2 to your Saving Throws.

3 Creatures: Your reckless attacks no longer grant advantage to creatures attacking you.

4+ Creatures: Your attacks also apply your Constitution modifier to damage rolls.