The Ghost Kingdom

The Ghost Kingdom is a nation in southern Ashar. The population of the Ghost Kingdom is thought to be around 1,500,000. The people of the Ghost Kingdom, which are known as the Ghost Wolves, are nomadic and shamanic raiders. While not technically one of the Three Sisters, the Ghost Kingdom shares many similarities with them, and it is often referring to the Lost Sister because of this. While technically a nation, the Ghost Kingdom is unlike any other. It has no defined capital, or even any permanently inhabited settlements, for that matter, no official relations with any other nations, no defined border, and likely no central leader.
The Ghost Wolves, are known for known for their greyish-black skin and the traditional tattoos of eyes on their foreheads. They are divided into clans, each led by a shaman called a Spiritwalker. It is widely believed that Spiritwalkers can enter the Spirit Realm and communicate with the souls of the dead. The ancestors are thought to have great importance in Ghost Wolf society. It is believed by many that the Ghost Wolves consume the flesh of dead relatives. 
The Ghost Kingdom is believed to be ruled by the Ghost King (also known as the Shadow King), but only rumors and legends exist of him. Ghost Wolf clans have little to no contact with one another other than territorial skirmishes, which calls into question the idea of a central leader, although some have claimed that the Spiritwalkers meet in the Shadow Grove, a holy site in the center of the vast Sea of Black Grass, every few years, perhaps in communion to the Ghost King. 
The territory of the Ghost Kingdom is massive, although almost all of it is desolate desert and savanna, including the Sea of Black Grass, a vast region of black foreboding grass. To survive their infertile climate, the Ghost Wolves must raid other nations for their resources, most commonly the Three Sisters and the Horadric Empire. The Ghost Wolves are widely feared for their brutal aggression, mysterious nature, spiritual practices, and stories of their cannibalism. Ghost Wolf woman are almost unheard of it, largely because the Ghost Wolves kidnap and rape the women from the towns they raid to produce offspring.