Creation Et All/Great Contagion

From BluWiki

This supernatural plague was engineered by the Deathlords in the hopes of ending all life. Although the world survived, much of the glory of the previous Age was lost, as well as ninety percent of Creation's population. In its wake, the Fair Folk invaded en masse and would have destroyed it had not the woman who would become the Scarlet Empress dared enter the Imperial Manse and gained control of the Realm's First Age defenses. The Great Contagion is popularly considered the mark of the fall of the First Age.