Four hundred years ago a plague befell the world. It warped the bodies of all organic things and drove both man and beast rabid during the night. Law and order vanished in a matter of days, along with most of the human race.
Years passed and from this madness rose the Tyrants, a brutal god-like sect of individuals who could enforce their will on the surviving dregs of humanity. With their tyranny, they brought order back into the world and established settlements. A convoluted semblance of civilization began, aided by the magic of Necromancy, to raise those butchered in the night, and Hemomancy, to heal their injuries.
In Umbras, domain of the Tyrant Lock-And-Key, all humans are incarcerated at night where they cannot harm others or the city. Beyond that, Lock-And-Key does little to interfere with the lives of her subjects.
However, this fragile balance is threatened. A usurper lurks in the steam-riddled Undercity of Umbras, plotting his ascension to godhood. More than that, a stranger arrives in Umbras at night–crossing through the tormented, plague-consumed wilds–seeking revenge on those who murdered his brother.