The prison was created shortly after the Angelos Concordat was signed to signify the end between the Abrahamic Heavens and the pagan pantheons, and is built around the tomb where Saklas was sealed so it can draw power from the captured Nephesh to function.ДЄ research institute in the outskirts of a valley made of ice near Cocytus that investigates anomalies and irregularities that are disproportionate to the prison. It is placed in the deepest part of the Realm of the Dead where many rare and dangerous creatures live, and remnants of damaged souls of those who had committed the gravest sins or perpetrated betrayals are eternally bound to. The Kokytos Prison, also known as the International Prison of the Frozen Cocytus, is an inter-pantheon maximum security prison reserved for some of the most dangerous criminals the supernatural world has ever faced.

Known gateways to the mythological underworlds and their respective pantheon are: These gateways are fashioned out of precious metals and jewels, and are placed in the heart of a great temple complex of their respective religion. Once a year, all lighting in the realm, both natural and artificial, will be turned off for roughly an hour to be 'recharged' with new energy for the following year.ДЄccording to Persephone, located beneath the Realm of the Dead is the Dimensional Gap, where the magical force known as the Mist originated from.Д®ach of the mythological underworlds are connected to the Realm of the Dead through numerous gateways stationed all across the borderlands of the realm and the Netherworld, such as one that leads to Naraka, or Haides, or Yomi, etc. The only sources of light come from the numerous magic lamps and illuminating floras native to the realm. The sky here is always dark, with no celestial bodies or weather phenomena up upon the sky. There are also many rivers running through the realm, which smell like embalming oils and shimmer like crystals under lighting, which serve the function of masking away the natural smell of rotten corpse the realm originally had. The plants that can be found in the realm are often those associated with death or used in funeral rites, such as beautiful asphodels, fragrant mints, or pale white poplars. Outside of the metropolis are vast meadows of ghostly flowers, which make the realm appear as enchanting and serene from afara. Originally, however, the realm was said to be the same as Earth, though there were much more landmass as there were only large rivers and bodies of water in the Realm of the Dead instead of actual oceans. Imagery of such myths and journeys can be found in both ancient and modern art, and the descend itself has been described as 'the single most important myth for Modernist authors.'Дespite popular beliefs, the Realm of the Dead appears as a seemingly endless metropolitan city formed of numerous skyscrapers and buildings built of gleaming obsidian, all built around a giant pit where the core of the Realm of the Dead and the entrance to the Kokytos Prison is located.ДЄccording to Nico, the actual size of the realm is unknown, as it continuously grows each and every year without any warning, forming new territories for the chthonic pantheons to snatch in countless political and military struggles, as well as to accommodate the endlessly growing human population living on Earth. Other myths reinforce traditions that entrance of souls to the afterlife requires a proper observation of ceremony and/or funeral rites and offerings.ДЄ number of mythologies incorporate the concept of the souls of the dead making its own journey to the afterlife, with the dead needing to be taken across a defining obstacle such as a lake or a river to reach this destination. Common features of underworld myths are accounts of living people making journeys to the underworld, often for some heroic purposes. The concept of a life after death is found in almost every civilization and 'may be as old as humanity itself'.

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