As a bonus action, Nerovan studies a creature with a Wisdom (Insight) check contested by the target's Charisma (Deception). On a success, he can use Sneak Attack against that creature without advantage for 1 minute, provided he does not have disadvantage and can see the target.

As a bonus action, Nerovan can Dash, Disengage, or Hide.

After attacking with a one-handed weapon, Nerovan can fire his hand crossbow as a bonus action if it is loaded and he has ammunition.

Nerovan can make a Wisdom (Insight) check as a bonus action to determine whether a creature is lying, study a creature to learn its combat habits, or use his Insightful Fighting feature. He also gains Expertise in four proficient skills or tools.

Nerovan gains the Crossbow Expert feat, allowing him to ignore loading limitations, attack at close range without disadvantage, and make a hand crossbow attack as a bonus action after attacking with a one-handed weapon.

When Nerovan hits a creature he attacked during the same turn, that creature cannot make opportunity attacks against him for the rest of the turn.

When an attacker he can see hits him, Nerovan uses his reaction to halve the attack's damage.

When an effect allows a Dexterity saving throw for half damage, Nerovan instead takes no damage on a success and half damage on a failure.

Nerovan deals an extra 1d6 damage once per turn when he has advantage on the attack roll, or when an eligible enemy is threatened by one of his allies. The attack must use a finesse or ranged weapon.

Nerovan gains one Ability Score Improvement or feat.

Nerovan gains Expertise in two additional proficient skills or tools. His Sneak Attack increases to 3d6.

Nerovan increases his Dexterity by 1 and his Constitution by 1, gaining final scores of Dexterity 20 and Constitution 15 before later improvements.

Nerovan has advantage on Wisdom (Perception) and Intelligence (Investigation) checks when he moves no more than half his speed during the same turn. His Sneak Attack increases to 5d6.

Nerovan gains the Alert feat, adding his proficiency bonus to initiative and preventing him from being surprised while conscious. Hidden creatures do not gain advantage against him merely because he cannot see them.

Nerovan's Sneak Attack increases to 6d6.

Nerovan increases his Constitution by 2, raising it to 17.

Nerovan can detect magic, illusions, shapechangers, and invisible creatures within 30 feet with careful observation. He can use this feature a number of times equal to his Intelligence modifier, regaining all uses after a long rest.

Nerovan gains Blindsense out to 10 feet. If he can hear a creature within that range, he knows its location even if it is invisible or hidden.

Nerovan gains proficiency in Wisdom saving throws.

When Nerovan uses Insightful Fighting and hits the studied creature, his Sneak Attack deals an additional 3d6 damage. His Sneak Attack increases to 9d6.

Nerovan gains the Mobile feat, increasing his speed by 10 feet and allowing him to avoid opportunity attacks from creatures he has attacked during the turn. His Sneak Attack increases to 10d6.

He knows the hidden routes, service passages, back alleys, and quiet entrances of settlements where he has lived or worked. In a city, he can usually find a discreet path through crowded districts, identify a place where unwanted people are tolerated, or locate others who survive outside respectable society.