You focus your training on the grim art of death. Those who adhere to this archetype are diverse: hired killers, spies, bounty hunters, and even specially anointed priests trained to exterminate the enemies of their deity. Stealth, poison, and disguise help you eliminate your foes with deadly efficiency. 

Tools of the Trade

At the 3rd level, gain proficiency with disguise kits, poisoner’s kits. Your resourceful efficiency allows you to craft disguises and poisons at half the cost and time required. You have resistance to poison damage due to your time spent building up your tolerance. You may also apply poison to a weapon or ammunition as a bonus action instead of an action

Assassinate

Starting at 3rd level, you are at your deadliest when you get the drop on your enemies. You have advantage on attack rolls against any creature that hasn’t taken a turn in the combat yet. In addition, any hit you score against a creature that is Surprised is a critical hit. You can also add your proficiency bonus to Initiative rolls.

One with Shadow

When you are in an area of dim light or darkness, you can use your action to become invisible until you move or take damage.

While you are invisible from this action, your Sneak Attack Dice changes to a D8. Treat ones and twos rolled on your Sneak Attack dice as if they are threes.

Deadly Strike

Starting at 13th level, you become an expert of instant death. When you attack and hit a creature that is Surprised, it, double the damage of your attack against the creature.

Murder in Plain Sight

When you reach 17th level, you have become adept at killing in plain sight. You gain advantage when making a Stealth roll while using a Disguise Kit and enemies have disadvantage to see through your disguise.

While you are in disguise or hidden, you may make a Sleight of Hand roll against a target. If successful attacks against target will count as a Surprise attack, even while in combat, and the target will be unable to determine the origin of the attack.