This small wax-sealed vial is wrapped in a thin wooden lattice and looks completely empty unless it is held up to the light of a flame, where looking upon the vial reveals small ripples of swirling gas inside of it. As a bonus action the vial can be cracked, releasing the quickly escaping gas in the immediate vicinity of it, thus allowing the creature that cracked the vial to inhale the gas and gain the effect of the expeditious retreat, no concentration required.