The 4 divisions are Sustainers, Protectors, Perceivers, and Destroyers, with each having a role and function in the universe.
Long ago, the gods established the red city of Throne and populated it with four groups of people. Each was designed with a unique purpose in mind, and as their numbers grew, their lineage would create the foundations for the multiverse, which was henceforth called the Wheel.
The history of these people is a turbulent one, and some people were affected more heavily by the carnage of the Universal War. For example, the angels experienced a massive cultural schism after the destruction of the Concordance, but the reaches of the great war never affected humans to any noticeable degree.
The four orders of inheritors include the sustainers, the protectors, the perceivers, and the destroyers.
The Sustainers have white souls and are the children of the god UN. They include spirits and servants and were made to build, but not perceive the universe.
They were created from the Cool White Flame by the god Koss. They do not die unless they are killed.
The protectors, more commonly known as angels, were constructed to protect the universe. They have white souls and are the children of the white god UN. After Throne was established, the angels served as the attendants of the gods, but the city became corrupted and the gods eventually died out while the angels were left undisturbed.
When Zoss breached the firmament, he slew the original prime angels and inherited Throne, restoring order and ushering in a golden age. But the peace was not to last. As Throne grew corrupted once again the world broke out in Universal War, splintering the angels and leaving many to their own devices.