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The D'ni are a civilization that once existed in an underground cave system on Earth. The people of D'ni were practitioners of the Art, a skill that allowed them to write books that could transport them to other worlds, called Ages. The original D'ni civilization was destroyed by Veovis and A'gaeris, with the majority of the D'ni people perishing in the catastrophe that they orchestrated. Some D'ni survived to the present day, however, and Atrus, the main character of the Myst series, is one-quarter D'ni.