The Cataclysm, also known as the N0 Cataclysm or the Upheaval (early LINE Webtoons) occurred in the year D1000 (which changed into the year N0 after the event) and was named such because of a series of disastrous events: the disappearance of the primeval gods Vishnu and Shiva; the destruction of various planets and galaxies during a large-scale interracial war that involved gods, suras, and humans; and the weakening of the bonds between gods and humans (severely reducing the success rate of the god-summoning Idha Etu magic and the amount of power humans can borrow from gods).
Some say that the disappearance of Vishnu and Shiva caused the Cataclysm; some others say that their disappearance was the Cataclysm itself. The consequences were as disastrous as the event itself: the races were separated by Vishnu into three existing realms, thus ending the war, while many pure-blood humans and quarters suffered because of the emotional resonance that made the half-blood humans maddened against their own friends, relatives, and lovers. As a result, the halfs ended up being discriminated against and treated like slaves, sold, and killed for the consumption of their body parts without any remorse from humans.
- The Cataclysm began on a still-unnamed planet. Currygom stated that it was a different planet from Willarv, Carte, Isholy, and Konchez.
- The suras received the worst of the three realms, with a poisonous atmosphere and constant inter-clan struggles for survival and power. This environment is particularly harsh to the Gandharva clan.
- N0 is also the year of Kubera Leez's birth.