A Life on Stage. The Cinder Thespian has advantage on saving throws against being charmed. Also, it has advantage on Wisdom (Insight) checks in identifying a disguised creature.
Actor. The Cinder Thespian has advantage on Charisma (Deception) and Charisma (Performance) checks when trying to pass itself off as a different person. Also, it can mimic the speech of another person or the sounds made by other creatures. A successful Wisdom (Insight) check contested by the Cinder Thespian Charisma (Deception) check allows a listener to determine that the effect is faked.
Assassinate. The Cinder Thespian has advantage on attack rolls against any creature that hasn’t taken a turn in the combat yet. In addition, any hit it scores against a creature that is surprised is a critical hit.
Cunning Action. On each of its turns, the Cinder Thespian can use a bonus action to take the Dash, Disengage, or Hide action.
Innate Spellcasting. The Cinder Thespian spellcasting ability is Charisma (spell save DC 13). It can innately cast the following spells, requiring no material components:
At will: thaumaturgy, vicious mockery
2/day each: burning hands, charm person, disguise self
1/day each: invisibility
Sneak Attack (1/Turn). The Cinder Thespian deals an extra 10 (3d6) 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 Cinder Thespian that isn't incapacitated and the Cinder Thespian doesn't have disadvantage on the attack roll.
Multiattack. The Cinder Thespian makes two melee attacks.
Shortsword. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 7 (1d6 + 4) piercing damage.
Hand Crossbow. Ranged Weapon Attack: +6 to hit, range 30/120 ft., one target. Hit: 7 (1d6 + 4) piercing damage.