Path of the Slasher

For some Barbarians, their rage has a darker manifestation that consumes them, ultimately leading their fury down a path of murderous intent. As their fury grows, demonic entities begin to take notice, revelling in the carnage left in the barbarian's wake before goading and exploiting their killing skill for personal gain. Path of the Slasher Barbarians are often seen as elusive boogeymen with superhuman strength and an unreasoning hatred. Others see a typical horror character. All that’s missing is a terrifying mask and a group of clueless teenage victims.

Boogeyman

At the 3rd level, you patiently lurk in the shadows, biding your time. You gain Proficiency in Dexterity (Stealth). In addition, you can add your Strength modifier (minimum of 1) to all Dexterity (Stealth) checks.

Killer Instinct

At the 3rd level, when you enter rage, choose one creature within 60ft that you can see to become your obsession until your rage ends, until the creature drops to 0 hp or until you make a weapon attack against a creature that is not your obsession. 

When you attack your obsession with a weapon attack, you deal double your rage bonus damage to the creature. 

Unkillable Horror

At the 6th level, the evil growing within heals you after you suffer a grievous wound. While raging, when you take damage that reduces you to below half your max hp, you can choose to regain hp equal to your barbarian level + your constitution modifier. 

Once you use this feature, you can't use it again until you finish a short or long rest. 

Terror Radius

At the 10th level, the horror you bring overflows into the physical realm. When a creature within 10ft of you takes damage from a weapon attack, as a reaction, you can force the creature to make a Wisdom saving throw (DC equal to 8 + your strength modifier + your proficiency bonus). On a failure, the creature takes 1d12 psychic damage and is frightened of you until the end of your next turn. On a success, the creature takes half damage and is not frightened. 

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. 

Malevolent Power

At the 14th level, creatures can't seem to escape your murderous intent. As a bonus action, you can briefly surround yourself in hellish fire and teleport up to 30ft to an unoccupied space that you can see. If you teleport within 5ft of a creature, you can make a melee weapon attack against it as part of this bonus action.

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.