It was formed through a massive explosion of Abyssal power during the Tragedy of Sablier, as a result of Jack Vessalius and his Chain, Oz the B-Rabbit severing the Chains the bound the world together. The total annihilation of the world as well as Jack's plans were thwarted by Oswald, the then Glen Baskerville, and Alice, with the former using the Black Winged Chains, to stabilize the breaking Chains (stabilizing force), and the latter preventing Jack from causing any more harm. Although the damage was reduced, Sablier could not be spared from its grim aftermath.
Around one hundred years later, Sablier has fallen into complete ruin, the Baskervilles have seemingly disappeared, and the Four Great Dukedoms have risen to prominence, claiming the four other Doors to the Abyss as well as forming Pandora. The Hole is filled with Abyssal power, with dark vapours frequently forming in and around the area. The power is strong enough, and gets stronger further inwards, to warp beings into Chains and create illusions. The Dukedoms and Pandora have historically used Sablier, particularly the Hole, due to this reason, for various secret experiments, often with human test subjects, and this coupling with the odd unfortunate wanderer led astray, results in mishapen chain-like creatures that roam inside it.
The area contains many memories of those that lived in the area before the explosion, including some of Alice and Gil's, manifested into illusions by Abyssal power, as well as a piece of Jack's soul, with was shattered during his confrontation with Alice and the Intention of the Abyss. At its center lies hidden the 5th and final Door to the Abyss which Pandora seeks, as well as the Baskervilles' base of operations.
The farther in you get, the more you see the lost memories of the captial: Sablier. Jack Vessalius and Glen Baskerville once lived here. There were many people who lived here 100 years ago. It's said that this place holds the memories of those who want to forget memories.
When Oz, Gil, and Alice came here, they all saw memories; memories that were forgotten long ago. Alice was able to see and remember a memory of her's. She watched her past self with Jack. Gilbert also saw his past self with Jack and Vincent. Jack was glad to see him all healthy and well. He said that Gilbert protected him from Glen. He was glad for Gilbert to call him and that to be able to meet him again. He was always his cute and small servant. Oz met Glen Baskerville with the power from the Abyss.
It is inhabited by the people who was turned into a Chain and those who got lost in it. Its also a place where many were used in experiments by Pandora..
- The area incorporates the Baskerville's former castle/estate, as shown by the presence of the 5th Door, as well as a portion of Lacie and Alice's tower.
- Pandora has no idea that the Baskervilles are operating right under their noses.