The X-Seed 4000, also known as the "Book of Light", is a mysterious artifact that appears in the anime series "Neon Genesis Evangelion". It is a large, metallic book that contains information on the history of the universe, the creation of the Angels, and the secrets of the Human Instrumentality Project. The X-Seed 4000 is said to be the key to understanding the true nature of reality and achieving human evolution.
According to the series, the X-Seed 4000 was created by the First Ancestral Race, an advanced civilization that existed before humanity. The book was sealed away in a hidden location, and its existence was only known to a select few. However, the book was eventually discovered by SEELE, a secret organization that sought to use its knowledge for their own purposes.
SEELE used the information in the X-Seed 4000 to create the Human Instrumentality Project, a plan to merge all human souls into a single entity. They believed that this would bring about a state of perfect happiness and unity. However, the Human Instrumentality Project was ultimately unsuccessful, and the X-Seed 4000 was lost.
The X-Seed 4000 has since become a symbol of mystery and intrigue in the Evangelion universe. Its secrets have yet to be fully revealed, and it continues to be a source of speculation and debate among fans of the series.