Erebius

Erebius is a planet that has a population of 200,000 people that live underground.

Planet levels 1 - 100
Level 1 is the most populated level and the deepest one of course. It is filled with modern day houses and tons of cities. The higher the levels, the more darker and terrible it gets.

Level 10
Level 10 is full of middle-class people with one of the highest trained guards on the whole entire planet and it has the lowest crime rates.

Level 40 - 60
Level 40 all the way to 60 is one of the darkest and the most emptiest places in the city. It is filled with spirits everywhere and it has never been discovered since. They use fast elevators to go from another level to the other.

Level 80
Level 80 is the highest level with cities.

Level 100
Level 100 AKA The surface is just void.