Regulus Corneas is a Sin Archbishop of the Witch Cult, representing Greed. He debuted in the second interlude of Arc 3, where he took on Crusch's military convoy, completely decimating it alongside its passengers, which included Rem. As the strongest and one of the oldest Sin Archbishops in the Witch Cult, Regulus had an air of mystery surrounding him and was responsible for many brutal mass-slaughters and annihilations in the century prior to the beginning of the story.