The world has suffered a magic apocalypse. We pushed the technological progress too far, and now magic returned with a vengeance. It comes in waves, without warning, and vanishes as suddenly as it appears. When magic is up, planes drop out of the sky, cars stall, electricity dies. When magic is down, guns work and spells fail.
It's a volatile, screwed-up world. Magic feeds on technology, gnawing down on skyscrappers until most of them topple and fall, leaving only skeletal husks behind. Monsters prowl the ruined streets, werebears and werehyenas stalk their prey; and the Masters of the Dead, necromancers driven by their thirst of knowledge and wealth, pilot blood-crazed vampires with their minds.