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The Abyss (アヴィス Avisu) is a dimension that has acted as the beginning and end of all things since the beginning of humanity and has numerous connections to all flows of time (allowing it to reverse a person's age, accelerate it or drop a person in a time period different from their own). Once the Abyss was a golden paradise bathed in light that was governed by the entity known as The Nucleus of the Abyss, although following the sacrifice of the Child of Ill Omen, Lacie, to the Abyss, this paradise shattered and became the dark and chaotic prison that the Abyss currently is with the creation of the Intention of the Abyss using Lacie's Abyss-born child as a vessel.

“	The soul that loseth its corporeal vessel doth become light... and in tandem with the wings of angels... doth travel the world covered in gold. And when a hundred cycles have elapsed... the journey cometh to its end... and another journey doth begin anew.	”
—Arthur Barma's explanation of The Rule of 100 Cycles

The Rule of 100 Cycles is a way for the Abyss to control the fate of souls that have separated from their bodies after death. As such, The Rule of 100 Cycles states that after being embraced by the golden world of the Abyss for 100 years, a soul may be reborn as another being. However, there have been two instances in history where The Rule of 100 Cycles did not apply to the souls of the dead. Chains are beings forged from the living or inanimate objects that have become saturated with Abyssal power and therefore become mutated into a new form. This removes Chains from The Rule of 100 Cycles, and makes it so that after a Chain dies, their soul is forever trapped within the Abyss. As well, following the Tragedy of Sablier, Jack Vessalius was removed from The Rule of 100 Cycles and completely rejected by the Abyss. This is because of the contact that Jack had made with the Nucleus of the Abyss when he came between Alice and the Intention of the Abyss when Alice attempted to destroy the Intention's memories with Oz the B-Rabbit's powers. In place of his soul's acceptance by the Abyss, Jack's body would be forced to age in reverse in a repeated cycle for the next 100 years, until one day when Jack's soul would eventually fade from existance forever.

Droplets of LightEdit

Due to the importance of the harmony of the Abyss, the Abyss sends out portions of its power in the form of Droplets of Light, which seek out individuals who were born with an Abyssal distortion around their souls. Once these Droplets of Light find an individual who has this distortion around their soul, the Droplets of Light will merge with the individual's body, saturating it with Abyssal powers and guiding the individual towards others who share the same purpose as they do. Thus adding another member to the Baskerville Clan.

The Baskerville ClanEdit

The Baskerville Clan is a group of specially selected individuals who had been born with a distortion around their souls and whom had been chosen by the Droplets of Light to become Messengers of the Abyss. The purpose of the Baskerville Clan is to act as guardians for the Chains which wind around Earth and prevent Earth from plunging into the Abyss, thus causing its destruction. To further this protection, the Baskervilles were also meant to protect the five Doors to the Abyss and their respective Keys to ensure that no outside source came into contact with the Abyss' power. The Baskervilles were also meant to have aid in their protection detail, being allowed to form Contracts with Chains from the Abyss to act as their companions in battle and overall.