Your agility lets you move and act with remarkable speed. You can take a bonus action on each of your turns in combat to Dash, Disengage, or Hide.

You can use the Help action as a bonus action, and when you do, the creature you aid can use your Help on an attack against a creature within 30 feet of you, if it can see or hear you.

Starting at 5th level, you can move away from a foe without exposing yourself to their full counterattack. When a creature hits you with an attack, you can use your reaction to halve the attack's damage against you.

You have a pool of expertise in skills and tools. At 1st level you gained expertise in two of your proficiencies, and at 6th level you gained it in two more. Your proficiency bonus is doubled for the chosen proficiencies.

You know thieves' cant, a secret mix of dialect, jargon, and code that lets you hide messages in normal speech. You also gain proficiency in one of the following skills of your choice: Deception, Insight, Intimidation, or Persuasion. At higher levels, you can glean more from conversations and have a way with criminal circles.

Choose an archetype that reflects your technique. As a Mastermind, you gain proficiency with disguise kits and forgery kits, and you learn two additional languages.

Your cunning plans make you an asset to any criminal network. You gain proficiency with the disguise kit and forgery kit, and you learn two languages of your choice.

When you reach 4th level, you can improve one ability score by 2, or two ability scores by 1 each, or take a feat. You gain the same again at 8th, 10th, and 12th level.

Beginning at 5th level, your attack deals extra damage once per turn when you have advantage on the attack roll, or when an enemy of the target is within 5 feet of it and you do not have disadvantage. At 14th level, this extra damage is 7d6.

At 6th level, choose two more proficiencies, or one more proficiency and thieves' tools, in which you gain expertise.

Starting at 7th level, you instinctively dodge out of the way of certain area effects, such as a red dragon's fiery breath or a lightning bolt spell. When subjected to an effect that allows a Dexterity saving throw for half damage, you take no damage on a success and only half damage on a failure.

You have an almost supernatural ability to read the world around you. You gain a +5 bonus to your passive Wisdom (Perception) score and cannot be surprised while you are conscious.

You have refined luck itself into a weapon. When you make an attack roll, ability check, or saving throw, you can treat a d20 roll of 9 or lower as a 10. Once you use this feature, you cannot use it again until you finish a short or long rest.

You can cause a missed attack to turn aside at the perfect moment. When you make an attack roll and miss, you can turn the miss into a hit. Once you use this feature, you cannot use it again until you finish a short or long rest.

You have a reliable network of criminal contacts who can provide information, shelter, and small favors from the underworld, so long as you do not ask for the impossible too often.