"Myst"s story begins with the arrival of a people known as the D'ni on Earth, almost 10,000 years ago. The D'ni are an ancient race who used a special skill to create magical books that serve as portals to the worlds they describe, known as Ages. The D'ni build a great city and thriving civilization in caverns. A young geologist from the surface, Anna, stumbled upon the D'ni civilization. Learning the D'ni language, Anna becomes known as Ti'ana and marries a D'ni named Aitrus; the couple have a son named Gehn. Soon after, D'ni is ravaged by a plague created by a man named A'Gaeris. Aitrus sacrifices himself to save his wife and child, killing A'Gaeris while Ti'ana and Gehn escape to the surface as the D'ni civilization falls.