Jura Tempest Federation

Jura Tempest Federation (ジュラ・テンペスト連邦国), also known as Tempest (魔国連邦) is the country founded by Rimuru Tempest in the Jura Forest.

After Ingracia, the Federation is the closest to resembling a 20th century city; thanks largely to Research and Development Department replicating modern objects and convienences from Rimuru's memory. The strongest of Rimuru's subordanites are the Four Heavenly Kings: Benimaru, Diablo, Shion and Gobta. Diablo's Black Numbers follow behind the strongest fighting force of the Federation.

Trivia

 * As no other continents have been revealed/discovered, the Jura Tempest Federation unofficially serves as the center of the world the story takes place in; the map of the known world shows the Forest of Jura to be between all other countries.