Path of the Slayer

Some barbarians are savages, led by their rage to pursue their own selfish wants and needs. Other barbarians harness their rage, and direct it towards a purpose... they target those who bring death and destruction, and rip and tear through their foes until there's nothing left. The Slayer bears an intense hatred for those who seek to bring chaos, and turns their desires back on them, bringing them to their knees with unending fury and unadulterated violence. 

Slayer's Wrath

At 3rd level, when you enter your rage, you may choose an enemy that you can see and mark them as the target of Slayer's Wrath. The first time you hit this enemy on each turn, you inflict an additional 1d6 force damage. This damage increases to 1d8 at 6th level and 1d10 at 10th level.

Slayer's Wrath only ends once the creature is dead or once your rage ends. If the creature dies before your rage ends, you may make another enemy you can see the target of Slayer's Wrath as a bonus action without expending another use of Slayer's Wrath. 

Additionally, your wrath drives you to unending, relentless fury, and you are invigorated by tearing your targets asunder with visceral glory. When you reduce the target of your Slayer's Wrath to zero hitpoints, you gain temporary hitpoints equal to your Barbarian level + your Constitution modifier. These hitpoints last until your rage ends. 

You may activate Slayer's Wrath a number of times equal to your Constitution modifier, regaining all expended uses on a long rest. 

Unshakable Hatred

Beginning at 6th level, your hatred for those who seek to manipulate and sow chaos grows ever stronger. You can’t be charmed or frightened while raging. Additionally, when a creature casts a spell or effect that would cause you to make a saving throw against being charmed/frightened, you may use your reaction to move up to half your movement speed towards the creature. If this movement brings you within melee range of the creature, you may make one melee weapon attack against the creature. 

Juggernaut of Doom

You become an unstoppable juggernaut of doom, unstoppable in your pursuit of the target of your wrath. You gain resistance to Fire and Necrotic damage while raging. If you already resist one of these damage types, you become immune to it. Additionally, while Slayer's Wrath is active, you have resistance to damage of all types dealt by the target of Slayer's Wrath, and while you can see the target of Slayer's Wrath your movement is not slowed by difficult terrain. 

Infectious Fury

Starting at 14th level, as a bonus action you can choose a number of allies up to your strength modifier to share in your wrath. Until the target of your Slayer's Wrath reaches 0 hitpoints, all of the allies you choose may use the Reckless Attack feature against that target. Additionally, the affected allies gain advantage on saving throws against being charmed or frightened.