The vast and extensive lore of Halo spans hundreds of thousands of years, with different factions being constantly at war against each other. There are many distinct species in the universe of the franchise such as The Forerunners, Humanity, and The Flood parasites which pose a threat to every other sentient being at all times.
It is believed that The Precursors, the first life form to exist in the galaxy of Halo, are the ones responsible for the birth of The Flood parasite. It is believed it was their experiments with manipulation of life while they were being attacked by the Forerunners that accidentally made The Flood come into existence.
Likewise, the vast lore of Halo allows fans to come up with many theories of their own, often even explaining the gaps in the story left by the developers. This time around, a particular theory speculates how a certain species might already be ruling the whole of the universe in Halo.
Fan Theory States The Flood Already Rules The Universe In Halo
As pointed out by a user on Reddit, there is a possibility that while The Flood had redacted from the war with the Forerunners, they might have been working on taking over the entire universe instead. This leaves only the Milky Way galaxy as the sole survivor and the last of what remains without the parasite.
The theory can hold credibility, as the Flood went dormant during one of the most crucial points of time in their war against the Forerunners. This is what gave the latter some time to finally rebuild back up and deal with humanity first.
It was The Flood’s return that caught the Forerunners off-guard. It is said that they waited and took over other areas of the universe while the Forerunners would drive themselves to be weaker than before, giving the parasite a chance to attack once again.
Aftermath Of The Flood’s Return In Halo
Catching The Forerunners off-guard, the most technically advanced species in the galaxy at the time was no big deal. A thousand plans were tried to eliminate the threat of the parasite, but it was to no avail. It all eventually led to the firing of the Halo Array, which wiped out all the sentient life of the galaxy as a last resort, leaving the invading Flood to starve.
Life was eventually reintroduced again as planned, which brings us to the events of the Halo video game series, where the beings are again divided into different factions, such as the Covenant, and Humanity. The Covenant worshiped the Forerunners as gods and misinterpreted the Halo Rings to bring transcendence if activated once again.
The Covenant also faced a threat from the humans, as they had knowledge that could expose the misinterpreted prophecies and understanding of the Forerunners. This eventually led to them declaring war on humans, in which Master Chief, the main protagonist of the game, comes along and uncovers the truth about the Forerunners and the Halo Rings.
