Path of the slayer
For barbarians who care little for their own preservation, who are wild eyed and thirsting for the challenge of ever increasing odds, the benefits to primeval, untamed savagery become clear. The Path of the Slayer is one strewn in bodies and flowing with blood, much of which belonging to the barbarian itself.
Seeking the thrill of danger and challenge, a slayer pits itself against perilous opposition. Inumerable hoards and impossibly large monstrosities are a welcome sight to a slayer, who delights in charging headlong into the fray, and potentially certain doom.
Wielding weapons in each hand, the slayer becomes a whirl of death, throwing themselves into their foes, welcoming their attacks as the slayer lays into them with rapid strikes. For every ounce of blood lost, the slayer spills gallons, riding a tide of violence until either the enemy is scattered, or their body fails.
Wild Strike
Starting when you choose this path at 3rd level, you toss aside the pretense of caution and flail your limbs to batter the enemy. When taking the attack action while wielding a weapon, that lacks the light property, in each hand and using reckless attack, you can forgo reciving advantage on your attacks to instead make a free weapon attack.
Unhinged
At 3rd level, your sense of preservation in the thick of combat is dulled, and you've become numb to the concept of fear. You have advantage on saving throws against effects that would cause you to become frightened.
Adrenaline Surge
At 6th level, you feel a rush in your fury as you unleash your aggression, driving you to unleash attacks with increased lethality. While raging, when you hit a target with an attack while using reckless attack, you can use a bonus action to use one of the follow abilities:
Fell the Giant: If the target you hit is a size large creature or bigger, the attack deals an additional 2d8 damage. This damage increases to 2d10 at level 10, and 2d12 at level 14.
Scatter the Swarm: If you hit a target while 3 or more hostile creatures, including the target, are within 5 feet of you, you may make a free weapon attack against a creature other than the target you hit.
Pummel the Body: You force the target you hit to make a consitution saving throw. On a failure, they recieve vulnerability to the damage of the next attack that hits them until the end of your next turn. If the creature has resistance to the damage, they instead take the normal amount of damage, and a creature who is immune to the damage is unaffected. The DC of this save is 8 + your proficiency + your strength modifier.
Ready for More
At 10th level, Your scar ridden body is a testament to the punishment you've endured leaping into fray after fray, but despite the surmounting wounds you are ever prepared for more. While raging, if the damage from an attack or effect would reduce you to below half of your maximum hitpoints, you can choose to gain a number of temporary hitpoints equal to twice your barbarian level plus your constitution modifier. These temporary hitpoints vanish when your rage ends. Once you use this ability, you cannot use it again until you complete a short or long rest.
Make Them Pay
At 14th level, you return pain for pain, punishing those who would grievously wound you. While raging, if you are struck with a critical hit by a creature within 5 feet of you, you can use your reaction to make a weapon attack against that creature. On a hit, the attack deals additional damage equal to the amount of damage the creature's attack dealt to you. Once you hit with this ability, you cannot use it again until after a short or long rest.