Cataclysm that referred here are villainous events in a form of the end the world or universe at hands of villains whom inhabited it. Cataclysmic villains often have vast amounts of power, and are similar to Dark Lords as they able to do such thing. Sometimes, it can be a dark deity or god-like figure. Also certain items and weapons and even worlds of evil can be presented as Cataclysm when they have such great and dangerous power beyond imagination.