Poison Smoke

Prerequisite – 8th level Rogue

With your action, you can expend two superiority dice to throw a vial of poisonous fumes. Each creature other than you in a 20 foot sphere centered on a point you can see within 60 feet must make a Constitution saving throw. Creatures who fail their saving throw take poison damage equal to two rolls of your superiority die and are poisoned until the end of your next turn. Creatures who failed their saving throw also take poison damage at the beginning of their turns equal to another two rolls of your superiority dice. Creatures who succeed on their saving throws take half of that damage and are not poisoned. This area is heavily obscured until the end of your next turn.