Take Dash, Disengage, or Hide as a bonus action.

Deal extra damage once per turn when you have advantage from surprise or when an ally threatens the target and no disadvantage applies.

Halve the damage from a hit you can see.

Take no damage on a successful Dexterity save against effects that normally deal half damage on a success.

Turn one failed attack roll or ability check into a success once per short or long rest.

You are trained to be especially deadly when you catch foes unaware. You have advantage on attack rolls against any creature that hasn't taken a turn in combat yet, and any hit you score against a surprised creature is a critical hit.

Your training is focused on stealth and sudden violence. You gain proficiency with the disguise kit and the poisoner's kit, and you can mimic the speech of a person or the sounds of a place after studying them.

You know how to make the most of a quick hand and a quicker escape. You gain proficiency with thieves' tools.

You are more adept than most at performing tasks requiring subtlety and precision. Choose two of your skill proficiencies, or one skill proficiency and your thieves' tools proficiency, to gain double your proficiency bonus. You choose two more at 6th level, and again at 11th and 16th level.

You can no longer be surprised while conscious, and other creatures have disadvantage on attack rolls against you if you are unseen by them and have not yet acted in the first round of combat.

Your skill with evasive movement improves further. You can move through a space as narrow as 1 inch wide without squeezing if a creature is not occupying it, and opportunity attacks against you are made at disadvantage.

Your talent has become instinctive. If you make an ability check using a skill you're proficient in, the d20 roll of 9 or lower is treated as a 10.

You are so elusive that no attack roll has advantage against you while you are not incapacitated and no creature can have advantage against you from being unseen unless it also meets other requirements.

At 13th level, you gain the ability to impersonate a specific creature with uncanny accuracy after studying them, making you a terrifying infiltrator.

You gain two additional uses of your expertise, allowing you to master four skills in total beyond ordinary training.

Thanks to ties of birth and title, you can usually secure an audience or hospitality among the upper class, provided your name still carries weight or your old house still has friends.