The Upper Moons are the most elite and loyal demons serving Muzan, the greatest threat to the Demon Slayer Corps and Muzan's best hope of finding the blue spider lily. Ever since the Mugen Train arc, ...

While the demon slayers have the Hashira to protect their backs ... due to multiple deaths at the hands of the elite demon slayers known as the Hashira. In fact, a prerequisite for becoming a Hashira ...