Path Of The Slayer

In the first age, in the first battle, when the shadows first lengthened, one stood. Burned by the embers of Armageddon, his soul blistered by the fires of the Nine Hells and tainted beyond ascension, he chose the path of perpetual torment. In his ravenous hatred, he found no peace; and with boiling blood he scoured the plains of Avernus seeking vengeance against the dark lords who had wronged him. He wore the Crest of the Knight Sentinels, and those that tasted the bite of his sword named him... Doom. You have witnessed the greatest evils of this world, some you even took part in. Then you sought redemption. As one who follows the Path of the Slayer, you entered the first layer of Hell and followed in the original Slayers footsteps to receive his blessing, and you returned to the material plain to grow stronger so that you might one day return to the Nine Hells and finish what the original Slayer started. Regardless of what you did before,  you have a new purpose now. Grow stronger, and destroy all evil at any cost.

Praetor Suit

Your armor is a part of you, a heavy metal skin, and your enemies will feel the weight of each blow.

Starting at 3rd level, you gain proficiency with heavy armor and can Rage while in heavy armor. Upon donning a suit of heavy armor you can spend 10 minutes attuning to it. Once attuned to it, it becomes your Praetor Suit. Your Praetor Suit can not be damaged and can not be removed from your body by any means unless you have unattuned to it. You can unattune to your Praetor suit as an action and the suit will become a regular suit of armor. Your Praetor Suit does take up an attunement slot. Your Praetor suit does not hinder your movement and you can ignore the weight of the armor while wearing it.  Something to note is that your Praetor Suit no longer looks like a normal suit of armor. It'll look hellish and foreign, so have fun describing it and make it seem unique.

Additionally, anytime you score a critical hit on a creature while you are raging in your Praetor Suit they must make a Constitution Saving Throw (DC = 8 + Proficiency Bonus + Strength Modifier) or become stunned until the end of your next turn. 

Incorruptible Soul

The powers of those who wish to see you fail have little effect on you. You are not subject to death or decay. You are Doom.

Beginning at 6th level, you can't be charmed or frightened while Raging. If a creature attempts to charm or frighten you while you are not Raging, you immediately enter a Rage, but you cannot enter a Rage in this way while you are unconscious. When you enter a Rage in this way, you gain the full benefits of a Rage until the beginning of your next turn, and this does not count towards the max amount of times you can Rage. However, by resisting magic in this way you take psychic damage equal to 5 times the level of the spell cast. If this damage were to reduce you to 0 hit points, you would instead be rendered unconscious and at 1 hit point. When rendered unconscious in this way you become immune to all damage, no longer need to breathe, eat, or drink, and cannot heal naturally until you regain consciousness. Only healing spells can bring you out of this unconscious state.  

In addition, you no longer need to sleep to gain the benefits of a long rest, you do not gain levels of exhaustion due to lack of sleep, and as long as you have killed an evil creature within the last week you do not need to eat or drink.

Rip and Tear

There is no better way for the evil of this world to die than by your brutal hands. Rip and tear until it is done.

Starting at 10th level, If you are within five feet of a stunned, paralyzed, restrained, or unconscious creature while Raging, you can use your action to Rip and Tear into them. Make an Unarmed Strike against the creature, on a hit, you deal five times your barbarian level in bludgeoning damage to the creature. This damage cannot be reduced in any way and ignores immunities and resistances. If the target creature dies due to this damage you and any allies within 30 feet gain temporary hit points equal to three times your barbarian level, and all enemies within 30 feet must make a Wisdom saving throw or become frightened until the end of your next turn. The DC is (10 + half your Barbarian level rounded up.) 

Slayers Rage

You are the embodiment of the Gods rage. All evil should fear you and quake in your presence. Go forth and cleanse the evil from this world... Rip and Tear. Rip and Tear. Rip and Tear!

Beginning at 14th level whenever you enter rage you can choose to gain one of the following benefits until your rage ends.

Slayers Resistance. You become resistant to all forms of damage except psychic and gain a bonus +4 to your Armor Class.

Slayers Haste. Your speed and jump height are doubled. You can also make one additional attack as part of your attack action. 

Slayers Wrath. Your unarmed attacks count as magical for the purposes of overcoming resistance and deal an additional 1d12 radiant or fire damage (you choose.) In addition, if you get a critical hit with an unarmed strike you can use your Rip and Tear ability as part of the same attack.  

Additionally, you no longer age as long as you have killed at least one evil creature within the last week.