An apocalypse is an event involving destruction or damage on an awesome or catastrophic event.
It seems like there may be a typo in your question. Did you mean "apocalypse"? If so, an apocalypse refers to a catastrophic event that leads to widespread destruction or the end of the world in various religious beliefs and cultural traditions.
The controversial end of the world! MWAHAHAHAHAHA! No joke, that's really what it is. I must sound like a maniac.