Great Calamity

The Great Calamity (大災厄 Daisaiyaku) is the name given to the series of events occurring approximately 400 years before Natsuki Subaru's arrival in the new world, where the Witch of Envy first appears. After untold casualties and destruction, a group, composed of the Sage, his apprentice, the First Sword Saint, and the Dragon Volcanica set forth to end the Witch of Envy's rampage. In the end, the Witch was sealed in eastern Lugnica. It is the paramount event in the Re:Zero world.