Unwelcome or calamitous events are often said to be due to the presence of an evil spirit or to be inspired by the personification of all evil in the figure of a chief devil or Satan. Such a figure is a source of terror in innumerable societies and, as a conception alone, may be at the bottom of many mental disorders.
Supremely evil figures include Satan (Shaitan), Mephistopheles, Beelzebub, Belial, Asmodeus, Lucifer, Moloch, Mammon, Iblis and Antichrist. In some myths and religious lore, the supreme evil was destroyed in a previous age, in others it exists still, and in still others, there is evil to come, such as the Great Beast or Antichrist expected at the second coming, before the end of the world.