When the mirror shatters, you see dozens of reflections of him, each appearing as the Everyman of a differing culture. Though, when the mirror is melted, his true form begins to escape.
Trapped within the Mirror Realm, the aspect of the Dark God called The Beast in the Mirror, is the Devil’s pitchman. He tortures and abuses his victims, goading them to enter his infernal bargains, often using their deepest vices against them. The Beast in the Mirror, once summoned, is very difficult to dismiss.