Alchemist's Folly, also known as the Jade Ruins, formerly King's Landing. Nobody alive knows how, why, or when the wildfire spread through the capital, but it was fast and sudden, and on the morrow, half a million souls were lost in the green inferno. It was said that the fires burned for days, and once they died down, the deadly jade fog spread through the charred ruins, unmovable by wind, snow, or rain. Only the residents of the Red Keep managed to escape through secret tunnels running beneath Aegon's hill.