Cien is a Demon baron formerly from the underworld that came to the world with Diablo. He was given the name Cien by Chancellor Rimuru Tempest of the Jura Tempest Federation. He as well lives in the Capital city of the Jura Tempest Federation: Rimuru City.
He is a big fat man of unknown age.
He is very obedient to his master and follows the orders absolutely without complaining.
He is one of Testarossa's subordinates.
During the Airship battle with the Emperor, Cien was in charge of capturing and killing anyone that tried to escape. He had the six hundred greater demons to create a spatial interference barrier to prevent anyone from teleporting away.
- Named after the car Cadillac Cien.