Reaper

A rather grim name for an elite assassin, Reapers excel at swift and stealthy maneuvers while maintaining focus amidst ongoing battles. Over time, they become masters of stealth and manipulate the chaos of battle to make decisive attacks against their targets.

Infiltrator

If you opt to Dash with your Cunning Action feature you may also Hide as a part of the Cunning Action, instead rolling Dexterity (Stealth) at disadvantage.

Alternatively, if you take Hide as an action or as a Cunning Action, you may use your reaction when a hostile creature ends their turn within 5 feet of you to move up to half your movement speed without provoking opportunity attacks.

Combat Awareness

As a bonus action, you can make a Wisdom (Perception) roll against a creature you can see, contested by the targeted creature’s Charisma (Deception) roll. If you succeed, all attack rolls you make against that creature are made at advantage for the next minute.

You can use this feature a number of times equal to your proficiency bonus + your Wisdom modifier, returning after a long rest. 

Shadowbound

While hidden, as an action you can become Invisible for up to 1 minute.

After making an attack while under the benefits of this feature roll a d20, on a 10 or higher you are not revealed to your attacker, and you remain Invisible. Otherwise the benefits gained from this feature end early.  You can use this feature once returning after a long rest.

Annhilate

Whenever you hit an enemy with your Sneak Attack, you may roll additional dice equivalent to the number of dice rolled at maximum value. If the additional dice rolled meet the same condition, you can roll additional dice until you no longer meet these criteria.

In addition, if the amount of damage dealt exceeds the remaining health of the creature, you may use your bonus action to make an attack with the same weapon against another creature in range, inflicting the attack’s damage plus the amount of remaining damage on a successful hit.