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

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

Sneak Attack. Once per turn, Viola deals an extra 35(8d6) damage when she 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 Viola that isn't incapacitated and Viola doesn't have disadvantage on the attack roll.

Cunning Action. Viola can take a bonus action on each of her turns in combat. This action can be used only to take the Dash, Disengage, or Hide action.

Multiattack. Viola makes one attack with her longsword and one attack with her shortsword.

Longsword. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 6 (1d8 + 4) piercing damage, and the target must make a DC 15 Constitution saving throw, taking 24 (7d6) poison damage on a failed save, or half as much damage on a successful one.

Shortsword. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 6 (1d6 + 4) piercing damage, and the target must make a DC 15 Constitution saving throw, taking 24 (7d6) poison damage on a failed save, or half as much damage on a successful one.