The Rammahgon was a well-known and influential work, one of the sacred Jedi texts, written in the Coremaic language with at least one chapter authored by a Jedi known as Kli the Elder, that compiled many origin stories of the Jedi. The original Rammahgon was believed to have been destroyed for over 5,000 years, until it was discovered by Luke Skywalker in the subterranean ruins on Ossus, and was later stored by Luke in the tree library on Temple Island on the planet Ahch-To.
The Rammahgon was a well-known and influential work, one of the sacred Jedi texts, written in the ancient, lost Coremaic language and protobesh cartouches, that contained four different and conflicting origin stories for the cosmos and the Force, and precepts derived from them. The Fourth Precept was a poem describing gods battling in the primeval universe, and is referenced by an omniscient "eye" on the cover. The book also contained information on Sith wayfinders and several diagrams of them, with one of them being at least 4,000 years old. It mentioned Exegol several times and even listed hyperspatial waypoints to the Sith stronghold, with annotations added by Luke Skywalker, connecting it to the the Jedi homeworld of Ahch-To. Other pages described deep space dangers and the Galactic Barrier.
At least one chapter was authored by a Jedi known as Kli the Elder:
The heavy Rammahgon was a leather-bound book, handwritten in ink on a primitive material known as paper. The spine and pages were made from uneti wood, and the cover of "clay" pressed from reddish interstellar gases found in the Unknown Regions.
The Rammahgon was written over 5,000 years before 35 ABY with at least one chapter authored by a Jedi known as Kli the Elder. By , a detailed illustration of Sith wayfinder was added to the book.
During the rise of the New Republic, in his travels across the galaxy, Jedi Master Luke Skywalker explored the subterranean ruins of Ossus and discovered the original Rammahgon text, which was thought to have been destroyed over five thousand years beforehand. He later collected the book, along with seven other bound books, in the tree library on Temple Island on the planet Ahch-To. Skywalker added his knowledge of the Sith wayfinder to the book along with additions that connected the Jedi homeworld of Ahch-To to the Sith stronghold of Exegol.
Skywalker added information on the Sith wayfinder and Exegol.
In 34 ABY, Rey discovered the tree library and Luke Skywalker explained to her what it was. In doing so, he told her the names of the books Aionomica and Rammahgon. After Rey abandoned her training, she took the sacred Jedi texts, including the Rammahgon, onto the Millennium Falcon when she left Ahch-To.
One year later, Rey kept the Jedi texts in her at the Resistance base on Ajan Kloss, where the heavy Rammahgon found its place on a shelf. To her disappointment she found nothing in the book that could help her contact the Force spirits of the deceased Jedi. Terrified by a broadcast of the thought-to-be dead Darth Sidious, Rey skimmed the chapters of the Rammahgon for the mention of Exegol in the book. She found the planet spelled as "Ixigul," and a cipher from Luke Skywalker on the same page.
With the help of the historian Beaumont Kin, Rey was able to read the text and Luke's notes on the Sith wayfinders in the Rammahgon to begin to find the way to Exegol, where her grandfather, Darth Sidious, Dark Lord of the Sith and the leader of the Sith Eternal, awaited.
The Rammahgon first appeared in the 2017 film Star Wars: Episode VIII The Last Jedi, and was identified as such in its novelization. In the Star Wars Legends continuity, Luke Skywalker found an ancient Jedi book in the Hall of Knowledge of the Great Jedi Library ruins on the planet Ossus.
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