Muzan is the king of all demons in Demon Slayer. He is the original demon - and the progenitor of all other demons in turn. He was saved by a medicine that transformed him into the first demon ...

As per the manga, Muzan was born during Japan’s Hein era. Throughout his young life, he struggled with illness. The doctor treating Muzan diagnosed him with a disease, saying that he would not ...

The castle is basically the secret base for the King of Demons Muzan and the Upper Moon demons and acts as their secret base of operations. What makes this structure so powerful is the fact that ...