The Gates of Hell.
The Gates of Hell (or Gate), as obvious by its name, is one of the gateways to Hell itself. It is where the souls of the damned are led during their time in Purgatory and when they have committed sins during their life in the human world.
Description[]
It is also revealed that there are multiple gates that lead to different underworlds stationed across the borderlands of Hell such as one that leads to Yamaloka (the Hindu equivalent of Hell), Hades (the Greek Underworld), or Yomi (the Japanese Underworld). These gates are fashioned in a way that fit the aesthetic and theme of the mythology they represent such as the gates of Yomi having artistic Shinto decorations around it.
It is said that beings such as Livyatan or Mot with the Gates of Hell are inextricably linked to one another, as such it is said that that their very maw, famously known as the Hellmouth, can lead to the depths of the Abyss as well (though this may be another entity instead). In legend, it is said that Leviathan's own body serves as its own realm of Hell and preys upon souls that attempt to escape from the Inferno, devouring them and sucking them inside its stomach, where they are forever to be burned in the flames of its body.
Overview[]
It is possible that a human who is not damned can approach the gate by means of projecting themselves in astral form. However, once approaching the gate, the human will begin to suffer extreme and disturbing images of their fears and failures driving them to madness and depravity. Even if the human is far enough away from the gate, they can still be affected.
Since it is possible that humans can travel to the gate by astral means, then it is shown that it also serves as the physical link between the mortal world and Hell itself. When the Gate is open, it does not lead directly into Hell, but rather the first circle known as Limbo, where it is there that Cerberus, the Hound of Hades, is tasked with being the gatekeeper.
