There are generalized elements of the campaign's historical background that can only be categorized as Precursor history. This includes the Age of Poisoned Sea and Sky and its immediate aftermath.
Cataclysm's Aftermath
The end of all that was, the beginning of all that is
The current stage of human history
Humans before the Cataclysm
Luddite sentiment gone amok
Enigmatic travellers with an interest in human civilization