Nobody knew when it came. One day, it was just here. Everywhere. It was calling something deep inside you, and more than half of the people stepping into the Darkness never come back. And then, it started to expand. Soon, it was at every street corner. Every nook and cranny. Until one fateful day, when an young doctor understood. The Darkness outside was just a projection of the Darkness inside. We needed to understand this, and to change ourselves. Light your inner fire. And just like that, it was gone. Memories of it transformed into stories. Stories slipped into legends. And after few hundred years, everybody forgot it. 

Until one day, when it was just here. Everywhere. Nobody knew from where it came.