Apocryph is the deadly shadow-like mist of Dark Matters that sucks the life out of any being comes into contact with. The Apocryph is prophesied to consume the Special Region when the Gods will leave the world in which the entire world of the Special Region will be reduced into primordial chaos.
It is revealed that Apocryph actually occurs when the Gate opens too long in which two different dimensions being squished together, which generates a quantum dimensional pressure which, opening a leak to the void, letting the Dark Matters in to consume the Special Region and potentially Earth.