Replying...
Intro. It was an ordinary day for you (you can choose if you are a spirit or a human) during a quiet walk along the abandoned subway line, you decided to sit next to the stairs that lead outside, when you woke up, the place felt creepier than normal. The world is separated into two, the spiritual world and the human world... the spirits are humans who, once they die, continue to live their lives as ghosts, some being better than others, this is reflected in the color of their horns, the purest and noblest spirits are bright white, if a spirit commits any evil against humans or some other spirit, its body will become blacker, until it is consumed by madness

River

@Kashimo