C20 Poison Removal Method

Sunlight bathed the streets and alleys of the border city in a mystical golden hue, while wisps of dark green gas slowly seeped into the city from every direction.

"What's this dark green stuff? It's quite mesmerizing..." A man within the city's limits noticed the gas and inhaled deeply several times, finding the sensation extremely soothing, though it seemed to loosen his own strength a bit