Path of the Hellrager

Thanks to MonkeyDM for this homebrew and i employ you to check it out

"Instead of being the Doomslayer sent to hell to clean the place, you are the exact opposite, from hell sent to purge the earth"

Appetite for Destruction

Starting at 3rd level, you feed on the despair your strikes inflict to push them further. Once per turn, when you score a critical hit or reduce a creatures HP to 0 you may make an additional melee weapon attack as part of that Attack action on your turn. This 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. 

Infernal Boon

Also at 3rd level, you receive hell's blessing to unleash destruction upon the world. You learn how to read, write, and speak 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 check.

Sacrilegious Strikes

When you reach the six level, the destruction you leave in your wake is unmendable. whenever you hit a creature with a weapon attack, you can force it to make a wisdom saving throw (8 + Constitution modifier + Your proficiency bonus). on a failure, you can choose to inflict it with one of the following effects:

It feels the need to unleash violence. On its turn, it must use its action to make a weapon attack. If the attack is made against anyone other than you, it takes 1d10 fire damage.

Its inner rage is boundless. It takes 2d10 fire damage, and the next weapon attack the creature makes against you is a critical hit.

you can use this feature a number of times equal to your Constitution modifier (a minimum of once). You regain all expended uses on a long rest. 

Skull Splitter

Also 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 you weapon attacks score a critical on a roll of 18, 19, or 20.

Running on Rage

When you reach 10th level, you find the meaning in the symphony of destruction you wreck upon the world, and refuse to let violent melody end. While conscious, critical hits cannot reduce you below 1 hit point.

Infernal Bloodlust

When you reach 14th level, your bloodlust cannot be quenched nor killed. When you fall under half your maximum hit points, you may expand your reactions to gain the benefits of the hast spell. These last for 1 minute and do not require your concertation, nor does this count as a spell for the purpose of dispelling or countering magic. Whenever you score a critical hit while under the effect of this feature, you refresh its duration, up to a maximum of 10 minutes.