Cunning Action. On each of its turns, Thinnings can use a bonus action to take the Dash, Disengage, or Hide action.

Sneak Attack (1/Turn). Thinnings deals an extra 7 (2d6) 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 spy that isn't incapacitated and the spy doesn't have disadvantage on the attack roll.

Multiattack. Thinnings makes two melee attacks.

Shortsword. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit:5 (1d6 + 2) piercing damage.

Hand Crossbow. Ranged Weapon Attack: +4 to hit, range 30/120 ft., one target. Hit:5 (1d6 + 2) piercing damage.

Change Shape. Thinnings can make himself as flat as a piece of parchment or revert to his normal thickness. In his flattened form, he can slide under doors, roll himself up, or even fold himself into the pages of a book.