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Note:Fictional details from the Myst franchise follow, and will be treated as facts.
Spoiler warning: Plot or ending details follow.
Garternay, said to mean Root of the Great Tree, was the old and possibly original home age of the people called the Ronay. Garternay was an ancient world orbiting a Red giant sun, and it was known to the Ronay that their world would relatively soon no longer be able to sustain life. Fortunately they had developed the Art: a way to write special Books which provides a Link to another Age.
Several Ages were written to house the Ronay exiles, and the majority Linked to Terahnee, an immense fertile world. A conservative minority, led by the Writer Ri'neref, instead decided to leave the host of the Ronay, as they felt that the Ronay had become too arrogant and had forgotten their humility. This splinter fraction instead linked to the Age of D'ni (Earth), an Age written by Ri'neref. Here they formed the D'ni empire.
Garternay is believed to have been destroyed by natural forces at some point after the exodus, and no Linking Books have been found. Intriguingly enough, Garternay was however listed as an Age under preporation by the D'ni Restoration Council, suggesting at least one Linking Book had been found.
He was accepted into the Guild of Writers at the age of five (a standard age) and, as the years passed, quickly became one of the finest Writers that the Ronay had ever seen.
Around 59 BE, the fact that Garternay would not be able to serve the Ronay as a home for much longer* was confirmed and the information made public.
Ri'neref had long known of the state of Garternay and from the time of his dismissal had apparently been working on an Age that he felt would be a good place to live for those who wished to follow him.
Their culture developed its own language and its own numbering system, and they had knowledge of how to access ("link to") alternate worlds ("Ages") through special books; they called this knowledge "the Art of Writing".
They wrote several Ages to escape its destruction; one of these refugees was the great Ronay Writer Ri'neref, who believed that the Ronay had become too prideful in their mastery of the Art.
What follows are four aspects of their culture given to us by the gameUru, found in journals within the game.