The current era is called the Golden Peace era. 500 years ago, there was a war called the Great Than War, caused by a group of Yeuthan that wanted to become greater than the Nuthan. They went around draining the life forces of humans and animal spirits, then targeted nuthan to become immortal. Humans fought back along with the Great Tailed Beasts, and many nuthan refused to join in for fear of their life force being drained. Finally, the Sky Emperor decreed that the Nuthan must fight back against the Yeuthan. The Yeuthan were defeated and pushed back to live in the far East of every region where the land is harsh and acrid, as a punishment. As a result of the war, Tailed Beasts remained in their habitats and are now rarely spotted and there is a great rift between humans and nuthan. The period after the war was called the Golden Peace era, which has persisted until now.