Relto is your "home base" in the Uru series. Written by Yeesha as a gift for Atrus and Catherine, it was meant to be a replica of Myst Island. It is different from any other age in the series in that it has the ability to change its appearance throughout the game. In Uru, you can find multiple "Relto pages" throughout the game. These pages, when added to the Relto book add certain features to the island.