Assassinate. During his first turn, Zarak has advantage on attack rolls against any creature that hasn't taken a turn. Any hit Zarak scores against a surprised creature is a critical hit.

Evasion. If Zarak is subjected to an effect that allows him to make a Dexterity saving throw to take only half damage, Zarak instead takes no damage if he succeeds on the saving throw, and only half damage if he fails.

Sneak Attack. Once per turn, the Zarak deals an extra 14 (4d6) damage when it hits a target with a weapon attack and has advantage on the attack roll, or when the target is within 5 feet of an ally of the assassin that isn't incapacitated and the assassin doesn't have disadvantage on the attack roll.

Special Equipment. Zarak carries a potion of invisibility, studded leather armor, +2, and 2 dagger, +2.

Multiattack. Zarak makes two Dagger attacks.

Dagger. Melee or Ranged Weapon Attack: +9 to hit, reach 5 ft. or range 20/60 ft., one target. Hit: 7 (1d4 + 5) piercing damage, plus an extra 7 (2d6) piercing damage if the target is a creature and Zarak has at least 18 hit points.

Garrote. Melee Weapon Attack: +5 to hit, reach 5 ft., one Humanoid. Hit: 8 (2d4 + 3) slashing damage, and the target is grappled (escape DC 11). Until this grapple ends, the target takes 8 (2d4 + 3) slashing damage at the start of each of its turns, and Zarak can’t grapple another creature or use Assassin’s Whim.

Assassin’s Whim. Zarak takes the Dash, Disengage, or Hide action.

Uncanny Dodge. Zarak halves the damage he takes from an attack made against him, provided he can see the attacker.