This book grants the knowledge of the multiverse of the Underground of Nydiliwyn. Both, Catacombs and Kingdom.
Each reality was created by Charun, after resetting. Hallucinations to maintain life in death, keeping Jake chained in his eternal death.
Forever stuck in a constant loop, where at first experiences "nothing happens", as he experiences being alive; but after each reset, he slowly dies more and more, until is just a spirit, what remains of his core when it was alive.
Each Volume is a different "canon" Anomalous Universe or Anomalous Timeline, AU or AT in dependence of how big the changes are, adn the story is being affected.
An AT is when characters are being changed in backstory and understatement. No major anomalies through, but enough to alter a different maintenance of story, similar, and yet different.
An AU is when everything changes completely, altering not only the characters, but the story itself. Unrecognizable anymore, as is a brand new story of the anomaly.
Each Volume will grant detailed and important information of each AU's and AT's stories, pasts/backstories, lores, and more. Detailed information of each important/relevant character.