This RPC is an ancient deuterocanonical book in the Old Testament that appears only in a Bible possessed by a small doomsday cult. At first, there is only one chapter of the book, while the others are written in an unknown version of Aramaic. However, as the reader progresses through each chapter they begin to understand the others.
Each chapter starts with the phrase "I Beeth Seth I Beeth Fith Bethoem," and ends with the phrase, "Deemv loth Mev Keht." These are the only phrases that cannot be understood. Since the only way to understand the other chapters is to read the previous one (with the first chapter already being fully understood), the reader must read the opening and closing phrases aloud. People who have read this book report that pronouncing these phrases is extremely difficult.
As the reader continues through the chapters, the story unfolds of the Jewish God, YHWH, sending a tall white humanoid without eyes or a mouth to a construction site where the Jewish people intended to build a pagan temple. YHWH ordered the anomaly to kill anyone within a 10 kilometer radius of the construction site.
The entire book is 51 chapters long, and if it is read by anyone outside of the cult, they will gradually go insane. Within two months, they become bald and pale, their teeth fall out, they become permanently blind, and their appearance comes to resemble that of the anomaly described in the book. They also become extremely violent.
The linguistic agents at the RPC Authority theorize that the name "Deemv" is the name of the anomaly protecting the construction site. After an interview with the cult leaders, the agents learn that the cult claims Deemv was originally a pagan priest who ordered the temple's construction and corrupted many of the Jews with his teachings. According to the cult, YHWH transformed Deemv into the eyeless humanoid and forced him to destroy what he had created.
The cultists also claim that a second book, "The Chronicles of Deemv II," was later removed from their Bible because even they could not safely read it. The book contains 12 chapters and tells of how the transformed Deemv was sent to murder every pagan priest and destroy every pagan temple.