It has more to it than that of course.
To understand this ALL, you'd need me to give you a ramble on the birth of the colliniverse, but I don't feel like doing all of that (it was intended to be a full ramble on its own) just as a prelude for my real ramble.
The cliffnotes that are pertinent are, the colliniverse (the name of the setting for Phyrra and Cyrus) is thusly named because of the collision (thus, colliniverse) between INFINITY and Nothingness (thus, why INFINIverse/INFIverse were working titles and preferred titles for the setting until unfortunately I learned they were taken, alas).
There are four realms making up the colliniverse: the spirit realm, demon realm, mortal realm, and afterlife.
The first entities began to form simultaneously in two of these realms: the demon realm and spirit realm. These proto-demons and proto-spirits began to take on some properties of their realm (demons got the short end of the stick, but due to this fact, were the innovators of several breakthroughs).
While it took a long time for them to gain both shape and form, once they had begun to do so, they began to interact with their environment. Spirits learned that unless suffering cessation of existence, they could never truly perish. This meant that while they could visit the afterlife, they could never permanently reside within.
Demons meanwhile learned that to go to the afterlife, they had to suffer irreparable damage to their form, usually the utter destruction of said form altogether--a one way trip. They could of course suffer cessation of existence like a spirit, but they also had a permanent destruction. Thus, demons basically invented the concept of death.
Spirits and demons alike found that they could procreate, creating more spirits and demons; spirits and demons found that on some occasions, new spirits/demons could form without procreation (more common for spirits than demons tho).
Later on, some demons found out that in spite of reaching adulthood and maturing, they would continue to go through the process of time development--and since at adulthood they were at a prime, they would go past their prime and wither, even die. Thus, demons invented the concept of aging as well, something foreign to spirits aside from in the context of birth-to-maturity (which spirits understood).
Spirits also found they could do something demons couldn't. In ONE specific area of the mortal realm, they found that they were able to influence it. They were vaguely aware of the vast expanse of the mortal realm beyond said area, but slowly shaped this world's properties, within the confines of what they were able to manipulate with their limited influence.
This world is the world on which Phyrra and Cyrus takes place. Spirits were struggling with creating anything with a soul in the mortal realm, in spite of now being able to (briefly) visit said realm. (Demons, too, learned that they could visit this realm.)
They had the right building blocks, but something was missing. The spark of life just wasn't there...
...Until a demon named Lilith deliberately, willingly, underwent cessation of existence to impart pieces of her soul to all of the potential proto-life.
This process was what the planet needed to jumpstart evolution. (Mind you, evolution of life was possible without her--it's just that she made it advance leaps and bounds. She also did this at least partially out of spite, to leave her mark on the world as a "screw you" to spirits.)
And thus, the world would forever bear her name: Lilim.
Incidentally, two more demons also contributed.
Once Lilith provided her mark, demons soon learned it was possible to imbue life with their soul, albeit suffering cessation of existence when doing so. Life, mind you. Didn't require demon souls in order to thrive. There's not a finite, limited, supply of souls. New souls for life are born all the time. It's just that it's possible for a demon to make one particular lifeform have their soul.
Incarnos figured out how to import himself to the mortal realm, permanently, WITHOUT suffering the cessation of existence demons previously had suffered. He even kept his identity and personality, albeit losing his original shape and all his prior experience. The trick was that it needed to be done from the afterlife, and to imbue the new life with its soul at the exact moment the life would gain a soul.
So Incarnos invented the process of...reincarnating.
And finally, perfecting both the work of Incarnos and Lilith, we have Huuma, who reincarnated himself into a proto-human, yet also managed to pass on a small piece of his soul (not enough to destroy him, but enough where all of his progeny would bear at least some of his gifts) to all of his offspring. The whole was retained, but still passed on.
And it was from him that humans eventually formed. (It was not instantaneous, mind you.)
Eventually, spirits and demons alike perfected their forms, their lives, their abilities, their aspects, and so on and so forth and how to enter into the mortal realm. But this is some of the backstory for the process, which I could elaborate on further if I gave you the original ramble on how this state came to be in the first place.
Butyeah. The world has a name now: Lilim.
Now I just need to unbury my drawing of a rough map of Lilim, and figure out how to create more precise geography and from that geography map out intuitive kingdoms from which I can then create the nations that will be named and visited.
And from there, it's naming cities. If I can name all major cities, then I'll have basically done the last bit of worldbuilding I need, since I already did worldbuilding on things like magical leylines, miasmic veins, and the like, with the distinction between beasts, demons, monsters, and whatnot. (Just because I neglected to share them doesn't mean I didn't do them!)
I'm getting to where scriptwriting will be ridiculously easy.