There are three worlds or planes to Charos. The plane of the Humans, the plane of the Fey Folk and the dark plane of the Deamons.

Each of these planes sit upon each other and are bound to each other, yet are separate. The human plane is the strongest the most resilient.
The Fey plane is the weakest, it is where magic mana seeps from giving mages in the human realm their power. From here also come impossible creatures and things of myth.
The Deamon plane is a dark prison where Deamons scream their torment. This plane is constantly weakening and needs continued upkeep, although those who have the knowledge of this are dwindling and soon, the walls of this plane will cease altogether. Strong Deamons are able to break through on occasion.