system
A chat on 4chan
human
Mongolian shamanism is an all-encompassing system of belief that includes medicine, religion, a reverence of nature, and ancestor worship. Central to the system were the activities of male and female intercessors between the human world and the spirit world. It has been developed on the basis of the belief in totemism and dates back to 3000 to 4000 BC. The Huns, ancestors of the Mongolians, worshiped shamanism and made it the state religion.

Tengrism is centered on the worship of the tngri (gods), Tengri (Heaven, God of Heaven) being one of them.
>The Heavenly World
The heavens are inhabited by righteous souls, the Creator and the protector deities. The celestial world has many similarities with the earth, but as undefiled by humans. There is a healthy, untouched nature here, and the natives of this place have never deviated from the traditions of their ancestors. This world is much brighter than the earth and is under the auspices of Ulgen another son of Tengri. Shamans can also visit this world.

>The Subterranean World
The underworld is the abode of wicked souls, ifrits (devils) and evil deities. There are many similarities between the earth and the underworld and its inhabitants resemble humans, but have only two souls instead of three. They lack the 'Ami soul', that produces body temperature and allows breathing. Therefore, they are pale and their blood is dark. The sun and the moon of the underworld give far less light than the sun and the moon of the earth. There are also forests, rivers and settlements underground.
gpt
For me it's Korean shamanism. Those motherfuckers make bank off exorcisms.