In this iteration of reality, history played out in much the same way as it did in The Real World. There were two exceptions. First, humanity was denied their traditional folklore and fairy stories; and second, steam-powered technology dominated the landscape. The successful voyage of the RMS Titanic in the Earth-666 iteration cemented the belief that there was nothing steam power could not accomplish, and thus: steampunk!
Of course, despite the well-laid Plan of the goddess Mira, pesky human beings just couldn’t leave well-enough alone. In the year 1912 CE, a disgruntled time traveler intercepted the warnings which were supposed to save the Titanic from its traditional icy fate.
As punishment for the slight, Mira unleashed a Calamity upon the unsuspecting world.