Prerequisites: Poisoner’s kit proficiency
As an action, you expend Maneuver Dice (up to your Proficiency Bonus) and use a poisoner’s kit to craft a vial of Masterwork Poison.
It retains potency until the end of your next long rest. You can’t regain your Maneuver Dice until this Poison is spent.
With the Use an Object action, a creature can apply the vial of poison to a weapon or piece of ammunition. On its next hit, it deals additional necrotic damage equal to twice the Maneuver Dice spent, and the target must make a Constitution saving throw.
On a failure, it has disadvantage on attack rolls, ability checks, and saving throws until a spell of 5th-level or higher (e.g., greater restoration) is used to neutralize the poison.
If the creature fails by 5 or more, it is Incapacitated, and it cannot move or speak until it is cured of this poison.