Spirits are as important to Roblox's history as Herobrine is to Minecrafts, while they are myths and mainly parts of their own communities now, it feels like an injustice and wasted potential not to utilize them in some form or manner.
Little note I didn't make obvious but did hint towards, was Spirits aren't common place anymore. Sure, they still happen, but their not everywhere like they used to be.
Part of this is because of Invers (inverted spirits, their purple :3c), their history of origin is unknown, as most things are in regards to Limbo, but their existence became incredibly necessary to the afterlife.
They specialize in ensuring those who need help crossing over their Limbos to ensure they get respawned.
Those who exist in robloxia help Spirits who desire to reincarnate.
Inverse themselves and Spirits found in Robloxia are unable to respawn but they may be reincarnated.
Spirits who loose their way exploring their Limbo's tend to almost backrooms slip out and into Robloxia.
They are not visible or interactable to a mass majority of Robloxians. Those who have a keen link to the dead, such as Builderman (touching on that in a second), may be able to sense them, but one of the only known beings to be able to see, speak with, and interact with the dead, is 1x1x1x1. (mainly cause I haven't thought of a reason for anyone else to <3)
1x4 is assumed to be able to do so because he's not from their world, allowing her access to things atypical to the average and even powerful.
1x4 however, cannot respawn or reincarnate Spirits. He can only interact and see them. They don't hold the necessary power, she can just see beyond the veil.
Builderman was created with the ability to respawn Robloxians and controls all matters of Spawn. He hasn't personally mastered those abilities to the fullest. It took him around a decade to be able to respawn without thought.
He exists with a "sixth sense", a part of his soul is in Limbo. It can be triggered when a spirit is in reach which will pull them out and respawn them, but the spirit must make the journey through Limbo to him.
Those who have died countless times may know their way through their Limbo and how to reach him, so its relatively easy for some to die and respawn.
Limbos change per individual. Some Limbos appear to people like mountains, steep summits and snowy peaks. Others see vast oceans, some dive deep or walk its surface tension. Some can even experience similar Limbos to that of an obby or cart ride game. It all reflects the soul of the person in some fashion.
Some people need a bit more help traversing their Limbos, like boats or rope or even a helping hand from Invers.
Limbos being so insurmountable for some without Invers, Spirits were so common that even those without natural connections to death felt intense grief around them influenced by the frustrated and scared Spirits. This grief tended to manifest as bad dreams that caused a lot of superstition around the dead of Robloxia when times were darker.
Knowledge of Spirits isn't commonplace, as most forget or feel like their Limbos were mere dreams, making experiences and characters to reflect their experiences, but there are a few who know the true nature of their existence.
Or something lol- might be subject to change but I do rather like this- so I'm keeping it for rn-
Ik I completely rehashed the entire concept of Spirits, but I'm pretty sure thats the idea really when it comes to AUs- so- shrug-