Gravemind (Form)

The Gravemind (Inferi Sententia, meaning "Thinking Dead"), voiced by Dee Bradley Baker in the games, is the final stage in the life cycle of the Flood, and one of the main antagonists of the Halo series. It is a near-omniscient creature with complete control over all Flood forms.

Life Cycle
A Gravemind starts out as a Proto-Gravemind -- a Flood form created by merging the bodies and biomass of numerous sentient life forms; some Flood forms may also be repurposed and merged into the Proto-Gravemind. After a Proto-Gravemind has been created, nearby Combat Forms will continue to supply it with fresh bodies, allowing it to accumulate mass and increase in size. Eventually, Proto-Gravemind reaches a certain critical mass and becomes a Gravemind. This critical mass tends to be in the thousands, if using human-sized bodies as a measuring unit.

The Gravemind, and its subordinate Flood infection, will then continue to accumulate. Eventually, when the Flood infection has become too large for even the Gravemind to control -- or when no life remains in the galaxy -- the Flood infection will reach the Intergalactic Stage, and Flood will leave the galaxy with the intent to create a new Gravemind elsewhere.

Description
Due to the brevity of its mysterious appearances in Halo 2, little is known about the Gravemind's physical form. It is a large monster whose "mouth" resembles a Venus Flytrap. Its mouth actually appears to have a second layer, as if there were another mouth inside of it. The organ is used to speak and to exhale Flood Spores, but whether or not it is actually used for respiration is unknown. The remainder of the Gravemind's body consists of a very large amount of tentacles. During its time beneath Installation 05's Library, some of its tentacles were miles long.

The Gravemind, like the Proto-Gravemind from which it formed, is made of countless bodies and corpses; The Art of Halo states that Gravemind is "literally built from the bodies of its enemies and its own fallen warriors reassembled into a massive, tentacled, and intelligent entity." Gravemind references this fact often, often calling his current whereabouts an empty grave or burial mound -- where there should be many graves, there is just the Gravemind. Even his name, "Gravemind", references this: he is the mind of the grave.

Gravemind is the controlling intelligence behind the parasitic Flood hive. In this way, he appears similar to a puppet master. When a creature is assimilated into the Flood, its knowledge is transferred directly to the Gravemind, and the remainder of its mind is destroyed. This transfer of knowledge has made the Gravemind virtually omniscient. In an archived conversation with the Forerunner AI known as Mendicant Bias, he compared himself to the AI, describing it as "a single intelligence inhabiting multiple [instances]" and calling himself "a compound [intelligence] consisting of a thousand billion coordinated minds inhabiting as many bodies as circumstances require". While it is not known how the Gravemind is able to communicate with subordinate Flood forms across the galaxy, his self-comparison to a computer network implies that similar techniques may be used, with each Flood form possibly acting as a networking node and redistributing the Gravemind's commands to other forms.

Only one Gravemind is known to have infested the Milky Way Galaxy before the Gravemind seen in the Halo Trilogy; it was stopped by the first activation of the Halo rings.

Halo: Combat Evolved
In Halo: Combat Evolved, a Proto-Gravemind was shown and disclosed on the level Keyes and could have very well become a fully-grown Gravemind, had it not been injured by the Master Chief and then later destroyed by the Covenant Special Ops stationed on the ring.

Halo 2
"Relax. I'd rather not piss this thing off."

In Halo 2, the Gravemind is seen utilizing Delta Halo's teleportion grid. After capturing the Master Chief and the Arbiter, the parasite gives them their "assignments" to stop the Halo's activation, and then teleports them to their respective targets. It is not known how the Gravemind, a non-mechanical Flood form, is able to tap into the teleportation grid.

He later uses the UNSC In Amber Clad to board the Covenant Holy City High Charity, crashing the frigate into a city wall and releasing numerous Pelicans full of the Flood plague. By the events of Halo 3, he has taken over the entire city, and all life within it.

Strangely enough, in Gravemind, the level named after him, there is no contact at all with him, apart from the cutscene in which he is introduced. The name of the level may refer to the Gravemind's introduction -- the first time in the series that a Flood form is formally recognized.

Halo 3
"I am a timeless chorus; join your voice with mine, and sing victory everlasting."

- Gravemind.

"Do not be afraid... I am peace... I am salvation."

- Gravemind to Master Chief. The Gravemind is one of the two primary antagonists in Halo 3, the other deferentially being the Prophet of Truth. At first, he does not appear in any form; later, when an Unnamed Flood-Captured Battlecruiser crash-lands on Earth and promptly begins to infect the city of Voi, he telepathically broadcasts messages to the Master Chief. When the Chief and the Arbiter traveled to the Ark to stop the Prophet of Truth from activating the Halo Array, the Gravemind used High Charity to make a Slipspace jump and crash-land on the megastructure. He briefly allied with the Chief and the Arbiter to stop Truth from activating the rings, but betrayed them the moment the crisis was averted. The duo managed to escape from their foe and discover Cortana's solution to the Flood -- a replacement Halo ring made by the Ark. To activate it, the Chief infiltrates High Charity to retrieve Cortana, who has the Activation Index from the first Installation 04.

As the Chief traveled deep into High Charity, he faced multiple Flood forms and heard the Gravemind taunt him, allowing Cortana to briefly send pained messages as he corrupted and tortured the UNSC AI. The Gravemind became increasingly frustrated at the Spartan's progress, becoming suspicious of what Cortana is hiding from him and threatening to "feast upon [the Chief's] bones" if he didn't reveal the secret.

After the Chief rescued Cortana, the Gravemind became enraged, realizing what her plan was and attempting to kill them both. His attack failed, however, and the Chief successfully destroyed High Charity, presumably killing the Gravemind. After traveling to Installation 04 (II), however, the Chief discovered that the Gravemind was attempting to rebuild himself on the new Halo. Despite his best efforts, however, the Gravemind failed to stop the Chief. In the end, the Gravemind is thought to be destroyed once and for all as Halo's activation destroys the Halo itself, and the Flood.

Halo Wars
The Flood on the Apex Shield World were well on their way to building a Proto-Gravemind, which acted as the primary base of the Flood in each battle that involved them. If Sergeant Forge and SPARTAN Red-Team had not destroyed it, it might have developed into a complete Gravemind like the one from Installation 05.

Personality
"Now the gate has been unlatched, headstones pushed aside. Corpses shift and offer room, a fate you must abide!"

- The Gravemind after Truth's death.

The Gravemind has an obscure and complex personality. When he was first seen by the Master Chief and the Arbiter, he was calm and collected, if not seemingly sad or mournful, and he spoke with a sullen tone in his voice. He was also quite logical, psychologically analyzing the duo, and trying to convince the Arbiter of the Halo Rings true purpose, to which the Arbiter reacted with stubborn pride. The Gravemind showed no irritation to this nor the bickering of 2401 Penitent Tangent and the former Prophet of Regret.

Later, though, the Gravemind showed a more emotional side, basking in his victory at High Charity, and displaying a sinister air of anger when demanding answers from the newly-captured Cortana.

In Halo 3, his personality is expressed greatly, although ironically, only a handful of his tentacles are ever seen. Early on, he is shown to have a calm and collected personality, but once the activation of the Ark is prevented, the Gravemind bursts into a victorious, maniacal laugh, briefly boasting in iambic heptameter.

In the following level, Cortana (Level), a broader spectrum of his personality is asserted. He begins with his calm and collected voice, as well as a slightly confident tone. As the Chief finds his way deeper into High Charity, however, the Gravemind becomes more irritated by his progress, and begins to shout at him. Once Cortana is rescued, the Gravemind begins to emit a series of mangled, animal-like roars, and speaks in an infuriated tone.

In the final level of Halo 3, Flood Dispersal Pods crash onto Installation 04 (II), and the Gravemind begins to speak again, this time in an angry yet confident tone.

The mostly collected and impassive tone that is frequently heard from it can be justified by his implied near omniscience; his knowledge of the present and ability to accurately predict the future means that he has little reason to worry about anything. He only becomes truly irritated or angry when an unforeseen event happens, or when there is something he doesn't know. Triggers for his anger include Cortana's secrets and the Chief's ability to rescue her. When defeated, he shows sadness, not anger; it may be that he has become used to omniscience, and is only truly angered when he is wrong. This is supported by the fact that in the level Cortana, his tone quickly changed to confidence and almost amusement when he realized parts of the Master Chief's objective (with phrases such as "Of course, you came for her! We exist together now.").

He is also known to be quite manipulative: in Halo 2, Gravemind tricks the Chief into being a decoy to distract the High Prophets as he attempts to take over High Charity, and in Halo 3, he helps the Master Chief and the Arbiter to help them kill the Prophet of Truth, only to betray them when they have outlived their usefulness. It is also notable that the original Gravemind was able to convince the Forerunner AI Mendicant Bias to join his cause and turn his fleet upon the Forerunners by telling him that the Flood are the next step of evolution and that the Forerunners are denying it.

The Gravemind is not violent until it is absolutely necessary; this is what makes a Gravemind a key point in Flood evolution. Unlike the savage and bloodthirsty Combat and Pure Forms that precede and obey him, the Gravemind is able to put aside differences when it is necessary.

By the end of the game, the Gravemind gives a short monologue in a disheartened tone, cryptically admitting that he knows he can do nothing to stop his fate, which he believes was unjustly forced upon him. He says that the activation of Installation 04 (II) will only add time "to a sentence [he] never deserve[d]". This seems to suggest that the Gravemind does not understand why the living races hate the Flood; indeed, he seems to think that it is only natural to absorb all life in the universe.

Trivia

 * In several Forerunner data logs, the controlling intelligence of the Flood is referred to as a Compound Mind.
 * The Gravemind resembles Audrey 2 from Little Shop of Horrors, a tentacled, plant-like alien who is fed humans to grow and who is bent on world domination. Parallels can also be drawn with The Overmind from the StarCraft franchise, the Hive Mind creature from the survival-horror game Dead Space, and even Sauron from Lord of the Rings.
 * Originally, the Gravemind was meant to have skulls as teeth; this was cut from Halo 2 and Halo 3 because it would have made it difficult for the parasite to speak.
 * The Gravemind seems to speak almost as if he is writing a morbid poem. He frequently speaks in trochaic heptameter.
 * Bungie employee Jason Jones initially didn't want the Gravemind to speak in an iambic rhyme, but he was persuaded by Joseph Staten.
 * Bungie staff and fans jokingly call it the "Little Shop of Horrors Reject", after the story in which a man creates a blood drinking plant batch and ends up having the plants grow so large as to kill and eat him.
 * He was initially going to have a much bigger presence in Halo 2 and would have his big introduction in the level Forerunner Tank, but due to time constraints, Bungie removed the level and instead made a long cinematic for his introduction.
 * According to a quote made by Bungie developer Jason Keith, found in and, it is implied that the Flood Hive of High Charity and the Gravemind were one and the same during Halo 3, thus making the level Cortana a boss fight, in a sense.