S. M. Stirling also takes a swipe at the inconstant-physical-constants field with the "Emberverse" series. "Dies the Fire" (2004), "The Protector's War" (2005), and "A Meeting at Corvallis" (2006), depict the world's descent into feudalism after a sudden mysterious "change" alters physical laws so that electricity, gunpowder, and most forms of high-energy-density technology no longer work. Civilization collapses, and two competing groups struggle to re-create medieval technologies and skills, as well as master magic. Like Boyett's novel, Stirling's features Society for Creative Anachronism members as favorably disposed survivors, and a hang glider attack against a building.