About EditAll living beings that are sentient and rational possess a Soul, with the exception of Dark Lords, whose soul was transformed into what is known as a Demonic Blood Soul. All souls originate from the Ludo-Rathowm and they are the source of life. The body of Ludo-Rathowm could be seen as a giant mass of souls. Mortals such as Humans, Kalars, Hannies, and Monsters are born from these souls and these procedures are overseen by the Gods.
In appearance, souls are small glowing and intangible orbs. They can't be touched or manipulated by any means by mortals. Only Gods and Devils have the ability to grasp souls, although there are a handful few exceptions like Dark Lord Warg. The soul itself starts in a blank and empty state but it is filled and updated with constant information from birth. It contains data like levels, skill levels, memories and personalities.
When the mortal dies, the soul is taken to Hell and would later return to Ludo-Rathowm. Since souls are filled with information gained from life, said information must be eliminated in order to return to Ludo-Rathowm's body. Onis in Hell, format these souls from all the raw data it possesses. Technically, it is possible for a mortal to revive in the period of time that exists between the time he/she dies and before the soul is formatted by the Oni, although only top tier Gods and Devils can do such thing.
Souls can be polluted from negative feelings such as pain, sorrow, regret, among others. The more polluted a soul is, the more incompatible it is with the Creator God, so Onis must also cleanse the pollution of a soul. All souls are polluted to a bigger or lesser extent in life, regardless who it is. The average soul is around 30-50% polluted in a single lifetime. Due to the excess of negative feelings, humans typically commit suicide upon reaching 80% pollution. In the extreme rare cases where a soul got 100% polluted, this soul can't be cleansed and must be thrown away, unable to return to Ludo-Rathowm.