until uru
Story
This section contains spoilers which could ruin the game for you if you have not played it before, or have not yet reached the end.
The story of the D'ni civilization began when they established their underground empire on Earth some 10,000 years ago. While living beneath the Earth's surface, the D'ni practiced what they called the "Art of Writing," which enabled them to create links to incredible, alternate worlds of fantastic variety called "Ages," to which they could travel through "Linking Books." The D'ni people thrived for thousands of years, but later met with a great catastrophe that all but ended their civilization. Their vast cavern was left uninhabited, and their Linking Books and Ages seemed lost forever.
Then, in the late 1980s, a few humans from the surface discovered that cavern. One of these humans was Elias Zandi. He devoted the rest of his life to exploring and, eventually, restoring that ancient city in the D'ni cavern, preparing to one day reveal their discovery to those who were suddenly feeling irresistibly drawn to the cavern.
When he passed away in 1996, his legacy was divided between a foundation that he set up and his only son, Jeff Zandi. The foundation came to be known as the DRC (D'ni Restoration Council). As their name implies, they took on the task of physically restoring the ruins of the D'ni cavern. If you choose to visit the cavern at some point, you're sure to run into them.
Jeff Zandi, on the other hand, was interested in learning why the D'ni civilization fell in the first place. He continued studying the teachings of Yeesha, by far the most talented of all the D'ni writers, and daughter of Atrus and Catherine. After years of learning, the younger Zandi is finally comfortable bringing others to an uru (a D'ni word meaning "large gathering" or "grand community").