ĭespite Contracting Oz and using his powers to sever the 'Chains,' Jack's attempted worldly destruction failed and resulted in the Tragedy of Sablier. He manipulates the Intention of the Abyss into creating a Chain with the power to destroy the 'Chains' making up the world, to which she offers Oz. Grateful to be given life, Oz sacrifices one of his bodies to convey a fragment of Lacie's emotions as her last message to Jack Vessalius however this act only gives Jack the motivation to forcibly join the material world and the Abyss.
Following Lacie's death, he became the companion of her twin daughters, Alice and the Intention of the Abyss. Over one hundred years prior to the story's beginning, Oz born when Lacie Baskerville presented the Core of the Abyss with a pair of identical rabbit dolls, one kept by Lacie and the other by the Core.
The true original B-Rabbit is not Alice, it is Oz.