Szeshen gains the Master of Tactics feature. He can use the Help action as a bonus action, and can do so at range when aiding an ally's attack.

Szeshen can use a bonus action to Help another creature. He can also use Help at range, and the aided creature gains advantage on its next attack against a target within 30 feet of Szeshen.

As a reaction, Szeshen can redirect an attack that hits him to a creature within 5 feet of him, causing the attack to target that creature instead.

Szeshen makes one weapon attack with advantage if he has not yet attacked this turn, or distracts an enemy so an ally can attack with advantage.

Szeshen makes a hand crossbow or dagger attack, adding 9d6 Sneak Attack damage once per turn when eligible.

Szeshen uses Cunning Action to Dash, Disengage, or Hide.

Szeshen uses his reaction to halve weapon attack damage, redirect a hit to a nearby creature, or make an enemy's attack target another creature.

Once per turn, Szeshen deals an extra 9d6 damage when he hits with a finesse or ranged weapon attack while he has advantage, or when an eligible enemy is adjacent to one of the enemy's opponents. He must not have disadvantage on the attack.

Szeshen has expertise in Stealth and thieves' tools. At 6th level, he also gains expertise in Perception and Deception.

Szeshen can communicate in a secret code used by rogues and understands thieves' cant.

Szeshen gains an Ability Score Improvement or feat.

Szeshen can use his reaction to halve the damage from one weapon attack that hits him.

Szeshen gains expertise in Perception and Deception. His proficiency bonus is doubled for checks using either proficiency.

When Szeshen makes a Dexterity saving throw to take half damage from an effect, he instead takes no damage on a success and half damage on a failure.

Szeshen gains an Ability Score Improvement, increasing Dexterity by 2.

Szeshen gains the Master of Intrigue feature and can mimic speech, writing, and behavior after studying them.

Szeshen gains an Ability Score Improvement, increasing Constitution by 1 and Wisdom by 1.

Szeshen's proficient ability checks cannot result in a total lower than 10 on the d20 before modifiers.

Szeshen gains an Ability Score Improvement, increasing Dexterity by 1 and taking the Sharpshooter feat.

Szeshen gains Blindsense. If he can hear, he is aware of the location of any hidden or invisible creature within 10 feet.

Szeshen gains proficiency in Wisdom saving throws.

Szeshen gains an Ability Score Improvement, increasing Wisdom by 2.

Szeshen gains the Soul of Deceit feature. His thoughts cannot be read by telepathy or other means unless he allows it, and he can make false statements appear truthful to magic that determines whether he is telling the truth.

No attack roll has advantage against Szeshen unless he is incapacitated.

Once per short or long rest, Szeshen can turn a failed attack roll, ability check, or saving throw into a 20 on the d20.

After spending 1 minute observing or interacting with a creature outside combat, Szeshen can learn whether it is his equal, superior, or inferior in two chosen aspects, such as Intelligence, class levels, or armor class. He also learns whether it knows any languages.

Szeshen knows the hidden routes, alleyways, service passages, rooftops, and forgotten corners of settlements. In a city he can guide companions through places known only to beggars, smugglers, fugitives, and children who survive outdoors.