Tormentor

Master of the Needle

When you choose this archetype at 3rd level, you master the ability to keep someone you damage alive. When you would drop someone to 0 hit points, you can instead choose to let them drop to 1 hit point, thus keeping them conscious and alive.
Additionally, when you attack a Grappled enemy, you have advantage on the attack rolls and you add your proficiency bonus to your damage rolls.

Tormentor's Gaze

Also at 3rd level, you gain proficiency in the Intimidation skill. If you are already proficient, you add double your proficiency bonus on your checks. This does not stack with Expertise.

Ruiner

A Tormentor can apply effects that ruin a creature's body. When you reach 7th level, after landing two consecutive attacks on a target, you can attempt to apply one effect to them as a bonus action. The target must make a Constitution saving throw against a DC equal to 8 + your proficiency bonus + your Charisma modifier. On a success, they resist the effect. On a failure, choose one of the following effects:

• Go for the Eyes: The target suffers the effects of Blindness until the end of their next turn.
• No Escape: The target's movement is halved until the end of their next turn.
• Numb Arms: The target's attacks that rely on their arms are made with disadvantage until the end of their next turn.
• Open Wounds: Attacks on the target deal a 1d4 extra weapon damage until the start of their next turn.

Brutalizer

At 10th level, when you lethally reduce a creature to 0 hit points, you can use Brutalizer as a bonus action to brutally murder your target. Every enemy that can see the act within 30 feet must make a Wisdom saving throw against a DC equal to 8 + your proficiency bonus + your Charisma modifier. On a failure they are frightened of you. At the end of their turn they can attempt the saving throw again.

Deeper Cuts

At 15th level when you attack a target that you have already damaged, you can use your bonus action to add your Fighter level to one of your damage rolls. You can do this once per encounter.

Art of the Torture

At 17th level, you have reached the peak of the torture. You are a master Tormentor.
When you attack a Grappled creature successfully, you score a critical hit.
All of your Ruiner effects last until the encounter is over. When you use Brutalizer, you can use Tormentor's Gaze to set the DC instead of your normal DC.

You can use Deeper Cuts to add your Fighter level for each of your damage rolls for one turn instead of one damage roll.