Soul

Soul (魂) refers to the spiritual being of Humans and Monsters.

The Soul is the core of every entity, there is no "being" any deeper than it. By itself, it's extremely fragile and usually requires a three-fold Body to be able to operate normally, though some Skills might enable only those known as Otherworld Reincarnators to survive with just their Soul alone, resulting in their Soul strengthening and most likely acquiring Skills, sometimes including a Unique Skill.

Nucleic Heart
This is the core of the soul, where skills are engraved; it is not possible to remove a skill, though, Greedy King Mammon can tear it out under condition.

Ego
This is the "being" of an individual, the memories and sense of self. An ego is the only part of the soul that could not be present, which results in insanity, but a being without an ego cannot access skills. It is described to be alike to a film of energy, wrapped around the nucleic heart. Reincarnaters usually lose most of their ego, but sometimes strong souls, like Satoru Mikami, can retain their ego through the dimensional travel.

Astral Body
This is the container for the soul and the form of a being. This layer requires a medium to preserve it, otherwise, it would dissolve and the ego and nucleic heart would be released, allowing for reincarnation. That medium is usually the body (flesh) but it can temporarily be the spiritual body. Those with the power to solidify the spiritual body are spiritual beings, like True Dragons, True Demon Lords, True Heroes, and Spirits, for some examples.

Traits and Names
Souls have different qualities; for example, only Humans can become True Heroes, and only Monsters can become True Demon Lords. Further, Humans usually have stronger wills than most monsters and can control more skills, versus, Monsters' Souls can control more power, in general, and thus are able to obtain Skills more easily however Monsters also start off as being nameless with varying amounts of strength and intelligence depending on species and the environment.

Unnamed Monsters can be named and become Named Monsters, becoming the Namer's subordinate and causing a Soul Corridor to form between the Namer and the Named, as well as the Named Monster gaining strength based on the disparity in Strength between Namer and Named; the stronger the Namer, the stronger the Named Monster gains in strength, though this process can also be adjusted.

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