Ten Fighters of The Underworld were lesser soldiers and assassins of the Empire ruled by Gaia.

Their commander was Mugen. They were sent to search for a dog who masters Zetsu Tenrou Battouga and to find Reima's Palace. While searching for Gin, they killed Bemu and Bill and rip off Hakurou's paw.

They eventually found and invaded the Palace with the help of Noroi, only to get defeated by the The Eight Canine Warriors of Sirius.

Only their commander survived, by running away.