Souls are a big part of the Soul Bound universe but may not be fully understood when reading the story so I figured I’d explain it in depth here.
When I was writing SB I questioned about what a soul actually is since everyone I ask irl has a different interpretation and doesn’t properly answer the question, it had to be something you’d be able to give away but might be hesitant to do so. So I made it that it has a solid answer within the story.
As a side note: although angels will be mentioned and they do exist within the SB world, they do not appear in the story due to their canonical behavior and nature. Angels have never been recorded to leave heaven and demons cannot enter heaven. Meaning there is no connection to them and therefore they do not appear.
A soul is a part of one’s being, however it is not your life essence like most media make it out to be. In the Soul Bound universe a soul is your ticket to the afterlife or in the case of celestials: reincarnation.
When an individual is born the soul has a certain level of information stored but is otherwise blank. The default information within a soul is basically the traits you are born with, such as things like curiosity, sexuality, gender identity, instincts, etc. In other words it is the aspects about yourself that you are unable to change, aspects that were woven within your very being. As a person ages and experiences life, their soul fills in the remaining blanks and shapes themselves into a more consistent shape.
Anything that has a soul (humans, demons, angels, etc.) are very much capable of living without a soul, however when they do die, they’ll cease to be. When does one lose a soul? You may ask. When a soul is damaged to the point it can’t maintain its shape after death then it will shatter completely and more or less turns to dust, taking the consciousness of said soul with it into the void, never to be revived again. Another way when a soul is technically lost is when you transfer ownership of that soul, which is typically done by the method of soul contracts. When a soul is sold and the individual dies, the person’s consciousness fades at a rapid rate, similar to when a soul is lost except the soul retains its shape and maintains the information that the soul has built up over the years.
What exactly are the differences between a human and celestial souls?
When talking about celestials it typically refers to demons and angels, who have roughly the same composition. When compared to humans their souls are significantly weaker, meaning it isn’t uncommon for them to not survive post mortem. The rates celestial souls cease to be are unique to whether you refer to demons or angels as angels have a higher rate of being wiped from existence. The rate for angel souls fading post mortem is roughly 70-85.3% while those of demons are currently 40-55%, although demon soul survival rates used to be much lower with a soul fading rate of 65-85%. It is theorized that the reason for the higher survival rate in modern times is as a result from prolonged exposure to humanity. The basis on this theory is due to the fact that angels do not have direct exposure to humanity while demons do, hence why angel rates of soul death remain so high. It would also explain why the survival of demon souls increased over millennia as human civilization evolved and human mortality rates decreased.
It is believed that celestial souls are weaker than those of humans due to their lifespan and magical abilities. Humans live on average to around 80 years old and do not possess powers while demons and angels do have powers and are immortal. Celestials do not die from age and are immune to most human/animal diseases, thus they only die when killed by an outside force (usually each other, humans or other forces). In short, it is believed that the soul strength is the trade off for lifespan and resilience.
What type of soul do hybrids have and are they mixed?
While human-demon offspring are a thing, their souls are not a mix between the two. Hybrids are by technicality not a thing as they usually result in a child that is either human or demon. Angel hybrids do not occur either due to the lack of proximity. Angels do not interact with humans nor demons, therefore hybrids do not occur.