In a world known as the Inscribed Bone Realm, death is not the end, but another form of remembrance. From the first cry of life, every word and deed, every smile and frown, every love and hatred, every merit and failing leaves an indelible, unfalsifiable mark upon the bones, as if carved by an invisible chisel through the passage of time. This is the Bone Book: an absolutely truthful personal epic written by life itself. It silently accompanies everyone as they grow and age, until their final breath.
When the flame of life goes out, the remains bearing all their memories and experiences are sent to a sacred place: the Hall of Returning to Truth. Engravers, gifted with special talents and powers, channel the pure Inscription Force within them. Under the catalysis of sacred flame, the subtle marks on the bones, impossible for ordinary people to decipher, release liquid memories and experiences that flow, gather, and solidify through the combined power of the Inscription Force and the sacred flame... In the end, they become weighty books that gleam with a gentle luster: the Bone Books. They are life's final and most complete answer sheet.
The Bone Book is truth, and truth is iron law.
This is the cornerstone on which the Inscribed Bone Realm has stood for millennia, and the creed that Engravers have spent their lives defending.
People believe in the Bone Books without question.
No one knows that this seemingly unshakable foundation of "truth" has already cracked, opening a fissure into an endless abyss. And its guardians have yet to hear the deadly whispers creeping from the shadows.