Aionomica

The Aionomica, a compilation of sacred Jedi texts, resided within the tree library hewn from an uneti tree. This library was situated on Temple Island, which itself was located on the planet of Ahch-To. These texts, penned in a forgotten language, were meticulously preserved in two volumes, namely Aionomicum I and Aionomicum II. Jedi Master Ri-Lee Howell, a historian, undertook this preservation. This two-volume set, acting as a codex, collection of correspondence, and scrapbook, compiled numerous early records of explorations and codifications related to the Force. The physical books contained handwritten passages from the original sages. However, the contents of these books were subsequently stored within holocrons, which were then lost before 34 ABY. A rumor persisted about a third volume of the Aionomica, which was the center of a forgery scandal that occurred 300 years before the Great Jedi Purge.

On the book's spine, the Aurebesh inscription "JE DI DE O" was present, with the letters stacked irregularly. Additionally, the Aurebesh word "MARTYN" was printed on the spine in a consistent, orderly manner. The letters "MD" were also visible on the spine, written in High Galactic.

In 34 ABY, Rey came across the tree library, and Luke Skywalker explained its purpose to her. During this explanation, he mentioned the names of the books Aionomica and Rammahgon. Upon her departure from Ahch-To, Rey brought the sacred Jedi texts, including the Aionomica, aboard the Millennium Falcon.