Naming of moons underworld, and Nix (a respelling of Nyx), mother of Charon, is the goddess of darkness and the night. Kerberos is a giant three-headed dog who guards the entrance to the underworld. The fifth moon is named for the river Styx that forms the boundary between the worlds of the living and the dead. The name of Eris's moon Dysnomia was suggested by its discoverer Michael E. Brown, who also suggested the name of the dwarf planet. The name has two meanings: in mythology Dysnomia (lawlessness) is the daughter of Eris (chaos). However, the name is also an intentional reference to
Scourge of the Underworld to avoid capture by Captain America. In 1993, Mark Gruenwald, who had created the Scourge of the Underworld and written nearly all of the main appearances of the character in "Captain America", wrote a four-part "USAgent" mini-series, in order to resolve the looming mysteries involving the character and his various forms and masters. The mini-series revealed that the Scourge of the Underworld was created by Thomas Holloway, the former Golden Age superhero known as Angel, who ran the organization with help from Domino and two henchmen known as Caprice and Bloodstain. Holloway had initially gone into retirement after a battle