Base Class: Barbarian
In the depths of darkness, those who follow the Path of the Damned emerge, bereft of compassion and tenderness. These barbarians, driven by an insatiable urge to guarantee eternal devastation, seek to set the world aflame, for in the end, naught lasts forever.
Appetite for Destruction
Starting at 3rd level, you feed on the despair your strikes inflict to push them further. Whenever you score a critical hit or reduce a hostile creature to 0 hit points, you may make an additional melee weapon attack as part of the Attack action once per turn. This attack does not count against the number of attacks you can make with the Extra Attack feature. In addition, whenever a hostile creature scores a critical hit against you, your next weapon attack against it is a critical hit once per turn.
Infernal Boon
Also at 3rd level, you receive hell's blessing to unleash destruction upon the world. You learn how to read, speak and write Infernal, and you gain proficiency in the Intimidation skill. You may use your Strength modifier instead of your Charisma modifier for ability checks using that skill.
Skull Splitter
Starting at 6th level, you are capable of incredible bursts of violence. Your weapon attacks score a critical hit on a roll of 19 or 20. Starting At 14th level your weapon attacks score a critical hit on a roll of 18, 19 or 20.
Hell's Fury
Starting at level 6, While raging if you drop to zero hp as long as you rage you will not fall. Upon your rage dropping you suffer two levels of exhaustion, are unconscious and fail one death saving throw.
Hell's Charge
Starting at level 10, you can use your bonus action on your turn to move up to your move speed to a point where you can see. As you move any creature in 10 feet of that point must make a Wisdom saving throw equal to 8 + your Strength modifier + your proficiency bonus.
On a failed save they must use their reaction to move 10 feet away from that point. If they can not use their reaction or already have used it they are frightened of you to the end of your next turn. On a successful save they are not frightened of you nor do they have to move. You can use this feature once per long or short rest.
Additionally, you have the advantage of saving against being frightened or charmed by a creature.
Hell's Guardian
By the 14th level, your bloodlust cannot be quenched or killed. When you fall under half your maximum hit points, you may expend your reaction to gain the benefits of the haste spell. These last for 1 minute and do not require your concentration, nor does this count as a spell to dispel or counter magic. Whenever you score a critical hit while under the effects of this feature, you refresh its duration, up to a maximum of 10 minutes. Once you've used this reaction, you can't do so again until you finish a long rest.