Backstory[]
Originally born to a good white magic family, Mercure one day decided to rebel against them and started secretly learning dark magic. Mercure was kicked out of his family for his rebellion and continued serving the dark mage who was secretly training him. After a war breaks out, Mercure puts to test the dark magic he learned. After his success and impact during the war, he was appointed as a knight. In the end, Mercure learns all necessary about black magic, but he decides to start conducting research to develop and create his own magic. In a video featuring Brans & Bransel, it was revealed that Mercure was experimenting dark magic on Nezha and Yu Shin.