Several reasons for the existence of the Void have been given: the innate division between good and evil in any nominally normal person; a "mind virus" put into place by the mutant Mastermind by order of the crazed General; the idea that the Void is in fact the true personality of Rob Reynolds and the Sentry is the false one; as mentioned above, the result of covering up his past; and, according to Norman Osborn the Sentry's superhumanity eroded his humanity, leading to a 'void' in his life. During the Siege storyline, the Void exhibits a more demonic form, capable of nearly slaughtering Thor, bringing down the entire city of Asgard, and striking down every immortal and mortal hero set against it simultaneously, killing the Norn Stone-powered Loki in seconds, and even tearing the god of war, Ares, in half. Norman Osborn claims that it is the Angel of Death, tying into an earlier prelude which showed the Void's presence in biblical times.