Rogue: Assassin

Original Source: Player's Handbook

Bonus Proficiencies

When you choose this archetype at 3rd level, you gain proficiency with two of the following: disguise kit, forgery kit, poisoner’s kit, or thieves’ tools.

Assassinate

3rd-level Assassin feature
You are at your deadliest when you get the drop on your enemies. You gain the following features:

Infiltration Expertise

As in the Player's Handbook but is now acquired at 3rd level.

Hitman

At 9th level, you excel at striking before your targets get the ability to react. You add your proficiency bonus to initiative rolls.

Imposter

As in the Player's Handbook

Death Strike

Starting at 17th level, you become a master of instant death. When you attack and hit a creature that hasn't taken a turn in the combat yet, it must make a Constitution saving throw (DC 8 + your Dexterity modifier + your proficiency bonus). On a failed save, double the damage of your attack against the creature. If the attack is a critical hit, you deal max damage.