Five Palaces

It is said that within the world of the nine heavens, there is a supreme divine world with five palaces. The central High Firmament Palace, the southern Jade Void Palace, and the northern Limitless Palace. The Jade Void Palace is the southern palace, the entrance to the heavenly palace, and the life gate. The Limitless Palace is its opposite, the death gate. Life and death face each other. Thus, to become an immortal in the southern palace can be taken to mean standing outside the Jade Void Palace’s gates, to being a single gate away from the High Firmament Palace.
The eight gates are Body, Life, Pain, Limit, Vision, Death, Terror, and Opening. They are also called the eight trigrams, corresponding to the Qian, Kan, Gen, Zhen, Xun, Li, Kun, Dui.