Trepidator

The Trepidator is a type of rogue that uses their uncanny knowledge about their enemies' fears to their advantage. They terrorize their foes, breaking their will to fight and keep going in the first place. Turning enemies against each other from the shadows by using poisons or by performing gruesome kills, this archetype uses the very minds of their foes against them without the aid of any magic.

Bonus Proficiencies

When you choose this archetype at 3rd level, you gain proficiency with the poisoner’s kit and the Intimidation skill. if you don’t already have it. Your proficiency bonus is doubled for any ability check you make that uses either of those proficiencies.

Terrorize

Starting at 3rd level, you have learned how to terrorize your foes, breaking their morale. When you reduce a creature to 0 HP with a melee weapon attack, you can use a bonus action to terrorize one creature hostile towards you, that you can see and can see or hear you. The targeted creature must succeed on a Wisdom saving throw (DC 8 + your Charisma modifier + your proficiency bonus) or be frightened of you for 1 minute. A frightened creature can repeat the saving throw at the end of each of it's turns, ending the effect on a success.

Unseen Terror

Starting at 9th level, you can try to hide when you are lightly obscured from the creature from which you are hiding. Additionally dim light doesn't impose disadvantage on your Wisdom (Perception) checks relying on sight.

Terrify

At 13th level, you how to exploit your enemies' psyche without your direct influence.

You have advantage on Charisma (Intimidation) checks and when you use the Terrorize feature you can instead choose to affect every hostile creature within 15ft of you that you can see or hear. 

You can use this feature a number of times equal to you proficiency bonus.

Fear incarnate

Starting at 17th level, you become a master of fear. Creatures frightened by you have their speed reduced to 0 and attack rolls against creatures you have frightened have advantage. Additionally when attacking frightened creatures your Sneak Attack damage increases by 3d6.