> The seat of power in the Covenant,
> the Citadel is the main nerve center
> for the interplanetary warfare of the
> Covenant. It offers a modular system
> that makes aggressive colonization
> and rapid deployment of troops and
> armor effective. This is where the political and religious
> leaders of the Covenant or their underlings issue orders
> to the various races and cultures that create the
> Covenant.
> The Covenant is a highly advanced collective of different alien races that completely control a large portion of the Orion Arm of the Milky Way Galaxy. A caste-oriented society consisting of a ruling religious class (the Prophets), a warrior class (the Elites) and a worker class (including the Grunts and Jackals, among others), the Covenant has previously – or so available data suggests – assimilated subjugated species into its society. However, Mankind’s first contact with the Covenant was their complete destruction of the Outer Colony Harvest.
> For thirty-two years, the Covenant has waged war against the Human race, culminating in the recent obliteration of the planet Reach. The Covenant’s objective appears not to be conquest, but the unmitigated annihilation of our entire species.
> The Covenant is a technologically advanced collective of alien species that controls a large portion of the Orion Arm of the Milky Way Galaxy. Millennia ago, the Covenant were a small, heterogeneous group who banded together for mutual protection. Intervening centuries have interwoven the customs and beliefs of the disparate species into a strong society. The Covenant is a caste-based society regulated by theocratic rule.
Thus, the Covenant had a presence in most of the Orion Arm star systems (which consists of stars). This is potentially billions of planets. This is not impossible. In halo wars, just one Covenant ship deployed more than seven citadeles. They had hundreds of CSOs. Thus, the Covenant controlled almost all the areas suitable for settlement in Orion Arm.
This is also a feat for the number of ships, since the Covenant had to support all of these colonies. Of course, they do not even come close to the fertile worlds of the forerunners, but there are still a lot of them. In the new canon, as far as I know, nothing refutes this quote and it makes it clear how independent the halo universe was. A civilization that has existed for thousands of years could well have established billions of permanent colonies. Nevertheless, halo wars logically fits this quote into the new canon. On the other hand, we know that the Covenant did not colonize planets - so most colonies are space stations.Although the Covenant’s primary homeworld, the Holy City of High Charity, was enormous, fully mobile, and even capable of slipspace travel, the alliance utilized many sites as anchors of military, political, and utilitarian dominion. At the base, this included the worlds and colonies of each species it had subsumed, but it would also grow to include new worlds and even Forerunner installations. The Covenant, as an empire, dominated much of the galaxy, though they would generally leave a world untouched unless it offered particular treasures, whether practical or religious.
It is important to note that the Covenant is “completely control a large portion of the Orion”, which means we are not talking about size, but about territories. If it was about size, then the word “completely” would have no meaning.
> Although the Covenant’s primary homeworld, the Holy City of High Charity, was enormous, fully mobile, and even capable of slipspace travel, the alliance utilized many sites as anchors of military, political, and utilitarian dominion. At the base, this included the worlds and colonies of each species it had subsumed, but it would also grow to include new worlds and even Forerunner installations. The Covenant, as an empire, dominated much of the galaxy, though they would generally leave a world untouched unless it offered particular treasures, whether practical or religious.
Thus, the halo waypoint agrees the Covenant dominated the entire galaxy. However, dominance does not mean control, but only that the Covenant across the galaxy had no competitors.
> THE GALAXY
> The Milky Way galaxy is vast, with hundreds of billions of stars separated by incomprehensible distances and tangled slipspace routes. Limited resources and other distractions mean that only a few thousand star systems in the Orion Arm have been explored in detail by humanity and the Covenant. The state of the wider galaxy is a mystery except for small islands of knowledge recovered from Forerunner vaults or through special pioneer missions.