Reaper

An order derived of assassins who learned to use the cover of darkness to the fullest. Unlike the assassin who will only reveal themselves before making a kill the reapers are more of a rumor than an enemy.

Shadow Concealment

At 3rd level, your training from the Reapers has allowed you to become undetectable. When you make an attack while hidden from the target on an attack roll of 10 or higher you remain hidden from that target regardless of whether the attack hits or misses.

Umbral Sight

At 3rd level, you gain darkvision out to a range of 60 feet. If you already have darkvision from your race, its range increases by 30 feet.

You are also adept at evading creatures that rely on darkvision. While in darkness, you are invisible to any creature that relies on darkvision to see you in that darkness.

Bonus Proficiency

At 3st level, you gain proficiency with martial weapons and if your campaign allows firearms you gain proficiency with them.

Banish

At 9th level, you've honed your ability to abuse your concealment. While you're hidden from an enemy and make an attack against them you can make an additional attack both of these attacks can benefit from sneak attack. You can use this feature once per short rest.

Distraction

At 13th level, you've learned how to use your surroundings to regain concealment when backed into a corner. 

When you make an attack against a creature you're not hidden from you gain a +5 bonus to stealth checks attempting to hide from this creature until the end of your next turn.

Silent Killer

At 17th level, your deadliness while unseen has become legendary. When you make an attack against a creature while hidden from them and you remain hidden after making the attack you can make an additional attack against the same target as a bonus action. You will always remain hidden after taking this attack and both of these attacks can benefit from sneak attack.