Black Horda

For centuries, people that harbour special abilities, the Hordarians, protect humanity from a threat they don't even know about.  Man-hunting Monsters, called Slayers, crawl trough cracks in a barrier of a strange world hidden to man.  Meet the Black Horda, the greatest and most powerful guild of Hordarians to ever exist... or, so they say.  What is their secret? How did this hidden world come to be? And is it only the Slayers you should fear?