How did the Flood get on the Halo rings?

According to Halo lore, the Flood is a product of a war between the Forerunners and the Precursors. Some Precursors, who lost the war, were turned into regenerative dust that created horrific mutations. The remaining Precursors assimilated into this newfound corruption.

How does the flood infect in Halo?

The process of infection begins with host contact. Tentacles protruding from its body penetrate the skin, and attempt direct communication with the host's spinal cord. Once communication is established, a potent attack of the nervous system is commenced.

How did the flood spread on Delta Halo?

The whole idea behind the Flood is that they spread through the infection of sentient beings, collecting enough biomass and intelligence to eventually form a gravemind. As far as we know, none of the Halo rings contained colonies of sentient life in the post-firing era.

Were the Halo rings created to destroy the flood?

In the level "343 Guilty Spark," Master Chief comes across the very thing that the Halo rings were created to destroy -- the virulent alien parasite known simply as the Flood. Throughout the series, the Flood have cemented themselves as the main antagonist of the franchise.

How did the flood survive the Halo Array?

Basically, the Forerunners couldn't come up with a way to kill the Flood entirely so they settled on killing their food supply to starve the Flood into hibernation until a day where either Forerunner survivors or some future race found a way to definitively destroy the Flood.

How the Flood survive the firing of the Halos (+ NEW HALO ANNOUNCEMENT!)

Can the flood infect Spartans?

Yes, they are human afterall, and the Flood can easily break through a Spartans Visor or Armour and infect them.

Are the flood on Zeta Halo?

Nope. Allusions are made in the early chapters of the Halo Infinite campaign that Zeta Halo hides a threat that stands to be far worse than the Flood. And the creepy parasitic species does not appear in any capacity.

Why were the flood kept on Halo?

The Flood were in search of the Activation Index, a device which would deprive UNSC and Covenant forces from the privilege of assured destruction of the parasite. On Installation 05, the Flood had been in a continual battle with the Sentinels after the initial firing of the Halos 100,000 years prior.

What did the flood want in Halo?

The Flood is driven by a desire to infect any sentient life of sufficient size; Flood-infected creatures, also called Flood, in turn can infect other hosts.

WHO released the Flood in Halo 1?

After losing two Marines, the first squad, together with Captain Keyes and Johnson, continued until they found a locked door. This was probably the same door that the Covenant forces locked in order to contain the Flood outbreak. Upon opening the door, they released the infection.

How did a Gravemind form on Installation 05?

The Flood quickly grew out of control around the area of the installation's Library; the Flood were kept contained by a Sentinel wall built around the Library. Somehow, the Flood on the ring were able to amass enough biomass to create a Gravemind.

How did the flood get on Installation 05?

A Forerunner structure deep in Installation 05. About 200 years prior to 2552, the Flood on Installation 05 escaped and evaded containment due to negligence on the part of the installation's Monitor, Penitent Tangent. The Flood quickly grew out of control around the area of the Installation's Library.

Are Flood in Halo infinite?

While the terrifying parasite didn't directly appear in the Halo Infinite campaign, players did notice that in the game's second level, Foundation, a Forerunner cylix labelled with a Flood Infection Form symbol could be found in a secret room (thanks, HiddenXperia).

Why did Cortana turn evil?

For those not in the know, Cortana is well past the age an AI should be, and she now suffers from Rampancy, which has essentially turned her evil. This new Cortana seems based on Dr. Halsey — just like the original — but it's the AI effectively in her infancy.

How did the precursors become the flood?

However, over millions of years, the dust became defective, failing to reconstitute the Precursors and instead inducing madness and mutations in lifeforms that came in contact with it. This form would later be known as the Flood.

How did gravemind get on High Charity?

Though he promises an alliance, Gravemind has ulterior motives. His Flood infest the human ship In Amber Clad and makes a slipspace jump into High Charity itself, in an effort to use the station to escape the confines of Halo.

Are hunters immune to the flood?

The reason Hunters cannot be infected with the Flood is the Hunters are not one creature. They are a lot of little worms that form into one big killing machine, and so, do not have a central nervous system.

Is infected in Halo Infinite?

The truth is that Infection won't be coming to Halo Infinite in a future update. This would be a good news for players waiting for Infinites to take on the classic game mode. Unfortunately, the leak has only revealed the gameplay of the startup screen.

Why did the forerunner keep the flood?

This was discussed in the Combat Evolved Anniversary Terminals. 343 Guilty Spark says that the Librarian decided to save them. She did this because of Ancient Humanities victory over the Flood 10,000 years before the Halos were fired.

Can the flood infect grunts?

This suggests that Grunts and Jackals are in fact readily infectable by the Flood, and are later augmented in some way to become Carrier Forms.

Did the Forerunners create the flood?

The Flood/Precursors found humanity worthy of the Mantle and instead traveled to take revenge against the Forerunners. It was later revealed that the Flood was not a creation of the Precursors, but the Precursors' perverted and insane remains of themselves.

Is the primordial still alive Halo?

While its body was ultimately destroyed, the Primordial would transfer its consciousness into the Gravemind, the Flood's compound intelligence, using the parasite as an instrument with which to exact its final vengeance on the Forerunners.

Why is Cortana on Zeta Halo?

Cortana wanted Zeta Halo, so she was present on it to maximize her chance of securing it. Her conversations with Atriox weren't so much her being trapped in a room as they were her not being willing to abandon the Halo to the Banished.