Opportunist/6th/Assassin

Killing Instinct

Starting from 6th level, you add your proficiency bonus to your initiative and to the damage of your Sneakstrike. (Proficiency bonuses don't stack, combine, or add together.)

Infiltration

Starting at 6th level, you become a master of getting where you aren't meant to be. You gain the following benefits:

• You have advantage on any Charisma check made to convince a creature you are someone other than who you are, or have credentials you do not.
• Your speed isn't reduced from climbing.
• At the start of combat, if you aren't surprised you can use your reaction to either take the Hide action or draw a weapon. You take this reaction before any creature takes its turn.