Cataclysmic

Cataclysmic villains, also called Omnicidal Maniacs, aspire to bring about the end of the world, universe, multiverse or existence they are in. To apply, said characters must be trying to destroy the entirety of the universe where each of their stories take place, so destroying planets when the story occurs in a whole galaxy like Star Wars does not count. Cataclysms have vast power and are similar to Dark Lords. Sometimes they can be Dark Gods or Godlike Figures. Cataclysmic villains may also be ones that previously caused massive destruction without completely destroying anything. Most of the time, they may be seeking to destroy their universe in order to (if possible) build a new one in their image where they control everything.

In extreme cases, they can also be reality-butchers as they have either tried to or successfully destroyed and ruined entire universes, dimensions or realities. They are the worst of the Destroyers and Genocidal, usually having no redeeming qualities. Most of them are also nihilists due to seeing creation as meaningless and causing destruction by seeking to erase them all from existence because of it (e.g. Invictus, The End, many versions of Unicron, Anti-Monitor, Kefka Palazzo, Bill Cipher, Johan Liebert, Amon, Diablo, Null, Absolute Solver, Ultron and The Lich). As such, villains of this archetype are almost guaranteed to cross the Moral Event Horizon and become Pure Evil due to their ambitions alone involving the near or complete destruction of all life in any given universe. However, some of them can still have redeeming traits, to the point of being genuinely affable, or in rare cases, even redeeming themselves (e.g. Count Bleck, Thanos, the Dark Lord, Gloomius Maximus, Tohru Adachi, Shiroko Terror, Light Hope, Galactus, Jobu Tupaki, Zen-Oh, Sailor Galaxia, and White Woz).

A subcategory of these are Harbingers for Rebirth who want to destroy a universe AND replace it with something else.

It is also the opposite of Cosmic Protection Heroes.