Base Class: Rogue
revised
Bonus Proficiencies
When you choose this archetype at 3rd level, you gain proficiency with the disguise kit and the poisoner’s kit. Your proficiency bonus is doubled for any ability check you make that uses either of those proficiencies.
Assassinate
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, if you hit any creature that hasn't taken a turn in the combat with a Sneak Attack, you can treat any 1 or 2 on a damage die as a 3.
Cloak and Dagger
At 9th level, you become adept at eliminating your targets in unexpected places. While wearing a disguise or assuming a false identity you have advantage on Charisma (Deception) checks and saving throws made to deceive a creature.
Premeditation
At 13th level, your foresight and planning give you an edge in combat. You have advantage on initiative rolls. Additionally, creatures have disadvantage on the first saving throw against any poison you use.
Deathstroke
At 17th level, few are as well-versed in the art of killing as you. Any creature that hasn't taken a turn in the combat yet has vulnerability to any damage you deal.