Path of the Hunter

Barbarians that take on the Path of the Hunter, become single focused during battle, singling out their prey in order to divide and conquer the battlefield.

Level 3: Hunter's Prey

When combat begins and you roll initiative, choose one creature on the battlefield to become your prey. While you are in a rage, all attacks against this enemy are done so with advantage, and your attacks against them are considered magical for the purposes of of ignoring resistances to Bludgeoning, Piercing, and Slashing damage. 

Additionally, attacks made against enemies aside from your chosen prey (Including, but not limited to attacks such as those made with a reaction), are made with disadvantage. If you choose to break your focus on your target in such a way that you attack another enemy, all attacks made against you until the end of your next turn, are done so with advantage. 

If the target is reduced to 0hp by your hand, these restrictions are removed. Also, you can immediately use a bonus action to move up to half of your normal walking speed, and make another attack. 

Level 6: Thrill of the Hunt

Thrill of the Hunt upgrades the Hunter's Prey feature. 

After reducing your target to 0hp, and before choosing to make your bonus action, you may choose another target that you can see to become your Prey. The previous restrictions for attacking off target creatures would still apply. 

In addition, you gain a bonus to damage rolls for attacks made with melee weapons, unarmed attacks, or improvised melee weapons. This bonus is equal to 1d6 + CON Modifier. This bonus stacks by 1d6 for each targeted prey that you successfully slay. This bonus and any bonus granted as a result of Hunter's Prey and it's associated subclass features, last for the duration of the Rage that you are in when it was triggered.

The associated movement and attack for slaying a targeted prey, also will only cost a bonus action on its activation once per turn, making it eligible to trigger more than once per round. 

Level 10: Bloodlust

Each time you slay a target, you may choose a new target, and the associated movement and attack afterward only cost a bonus action upon the first time that it is utilized during a turn. 

The also regain hitpoints equal to one roll of your hit die when you slay a target. 

Level 14: Apex Predator

While in a rage, the number that you need roll in order to score a critical hit is 19 - 20. This number reduces by 1, increasing the chance of scoring a crit, each time the Barbarian slays a targeted prey. This is up to a minimum of 15. Each time the critical threshold decreases, your Armor Class also decreases by 1, as your become singularly focused on your prey.