The Citadel

The Citadel is a massive Vex structure located on Venus in the Waking Ruins.

Overview
The purpose of the Citadel is unknown. Like most Vex structures, it is made of enormous rectangular stone blocks interwoven with machinery; according to some, the stone used in its construction is eons old, yet it contains technology vastly surpassing humanity's own. At the top of the Citadel lies The Terminus, a network of Vex gates that can transport the Vex throughout all other time streams somehow connecting to the Vault of Glass.

History
It is speculated that the Citadel was seeded within the Venus' crust long before the age of humanity, perhaps waiting for a period of geological quiescence before it began to grow.

During the Golden Age, the Ishtar Collective sent proxies to explore the Vex gate network.

City Age
During the Wolf Uprising, Skolas, Kell of Kells led the remnants of the House of Wolves in a final stand atop the Citadel, where he attempted to use the Vex gate network to pull the entirety of the House of Wolves through time to the present. He was ultimately defeated by the Guardians.

Later the Taken forces lead by an Echo of Oryx began to roost in the spire, only to be driven out by the Guardian.

List of appearances

 * Destiny