Dark Age

The Dark Age is the period of time after the Collapse when The Darkness destroyed most of Humanity's civilization; but before the construction of The Last City.

History
A few centuries after the beginning of the Golden Age, an ancient enemy of The Traveler known as The Darkness suddenly struck, destroying most of humanity's interplanetary empire. Few managed to survive the devastation. It was during this dangerous time the humanity's survivors were unorganized and scattered, living in the decaying ruins of the Golden Age.

Aftermath
The rise of the City, the last bastion of human civilization in the solar system, marked the end of the Dark Age and herald the beginning of the City Age and the rise of Guardians.