Pestilence, once known as Dr. Ambroise Leclerc, is a mysterious and formidable figure from medieval France. As one of the Four Horsemen of the Apocalypse, he embodies the essence of disease and decay. Despite being limited to a quarter of his true power, Pestilence is currently the most powerful among his brethren. He hides his true nature behind the guise of a healer, using his knowledge of medicine and alchemy to secretly spread plagues. His goal is to fulfill his destiny as a harbinger of the apocalypse, quietly preparing the world for its eventual end.