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 one vial of Advanced 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 bonus acid damage equal to the Maneuver Dice spent, and the target must succeed on a Constitution saving throw, or for 1 hour it has disadvantage on all attack rolls and ability checks. If it fails by 5 or more, it is Blinded for the duration.
The creature can repeat this saving throw as an action. On a success, the effect ends, but on a failure, it takes additional acid damage equal to your Maneuver Die.